which in turn vs which, in turn

Some examples from the web:

• External conditions generated a sudden downturn which in turn necessitated the adoption of drastic containment countermeasures.
• It made his blood pressure skyrocket, which in turn...
• A normal and varied diet contains many ingredients, which in turn contain many substances.
• A normal and varied diet contains many ingredients which in turn contain many substances.
• This has led to a deterioration of the balance between supply and demand which in turn puts producers' prices and incomes under pressure.
• Garbage attracts all kinds of germs, which in turn cause diseases.
• It caused a paraneoplastic neurologic syndrome, which in turn caused your blindness and coma.
• Intellectual property rights are a major prerequisite for developing new industries which in turn support job creation.
• Finally, the merger process may lead to elevated operational risks, which in turn might require further capital.
• EACEA is able to attract and retain highly qualified personnel, which in turn provides staffing stability.
• It also brings about openness, which in turn produces security.
• The measures in question consist of payments made by the Länder of Berlin and Brandenburg, which in turn receive funds for regional rail passenger transport from the Federal State.
• All lower level constituents are by definition subfields, which in turn, may be basic or compound.
• Furthermore, Bank Rossiya has important stakes in the National Media Group which in turn controls television stations which actively support the Russian government's policies of destabilisation of Ukraine.
• Greater transparency prevents inaccurate assessments, which in turn lead to bad investments - something we all wish to avoid.
• The impossibility of mergers has kept our air services market fragmented, which in turn has nibbled away at our airlines' competitiveness and led to high prices.
• Its fundamental objective is to raise the standard of living which in turn is a precursor to the equal treatment of citizens.
• The scope of this amendment is to promote a good level of interoperability, which in turn will determine a greater choice for end-users.
• Greece has revised its national account data, which in turn have been re-revised by Eurostat and the GNI Committee.
• And this culture is 'shaped' by an instrument that is the cornerstone of our individual and collective consciousness, which in turn creates a European hope.

Some examples from the web:

• Sep 16, 2009 ... i am cofused about meaning of 'which in turn'<<--(is this correct sentence?)^^;; Also, i don't know when i use 'which in turn' please, teach me ...
• Apr 26, 2014 ... Money can be exchanged for goods or services [ that fulfill people's needs and wants ] [ which in turn bring happiness ]. a) Money can be ...
• The vassals were subject to their lords, who in turn were subject to barons or kings. My car was hit by a truck, which in turn was hit by the van. Mr. X leaked the  ...
• Learning is a result of listening, which in turn leads to even better listening and attentiveness to the other person. In other words, to learn from the child, we must  ...