Complex sentence: Andy Nicholson is an English musician, best known for being the former bass guitarist of the Sheffield band, Arctic Monkeys and current member of supergroup, Mongrel which he set up in 2008 with Jon McClure of Reverend and the Makers.
Split into simpler sentences: Andy Nicholson is an English musician, best known for being the former bass guitarist of the Sheffield band, Arctic Monkeys. He is a member of the supergroup Mongrel which he founded in 2008 with Jon McClure of Reverend and the Makers.