Complex sentence: Stephen Maynard "Steve" Clark (23 April 1960--8 January 1991) was an English musician best known as the co-lead guitarist and a principal songwriter for the British hard rock band, Def Leppard, until 1991 when Steve died from alcohol poisoning.
Split into simpler sentences: Stephen Maynard "Steve" Clark (23 April 1960--8 January 1991) was an English musician. He was a guitarist and principal songwriter for the British hard rock band, Def Leppard, until 1991 when he died from alcohol poisoning.