Complex sentence: Andrew Garrard, who'd been the second largest donor to George Ferguson's election campaign, was appointed Managing Director of Bristol 2015 Ltd. He was also a member of the same Society of Merchant Venturers from whom Ferguson had stood down from shortly after the election.
Split into simpler sentences: Andrew Garrard, who'd been the second largest donor to George Ferguson's election campaign, was appointed Managing Director. Garrard remained a member of the same private group The Society of Merchant Venturers from whom Ferguson had stood down from shortly after the election.