question: What caused the delay in drilling after Shell 's 2008 purchase ?
answer: the refurbishment of rigs , permit delays from the relevant authorities and lawsuits
turker_answer: The delay in drilling after Shell 's 2008 purchase was the refurbishment of rigs , permit delays from the relevant authorities and lawsuits .
rule-based: The refurbishment of rigs , permit delays from the relevant authorities and lawsuits caused the delay in drilling after Shell 's 2008 purchase .