Complex sentence: Onslaught were formed in 1983 in Bristol, England by guitarist Nige Rockett and Steve Grice vocalist Jase Pope, and Bassist Paul Hill were then asked to join as Rockett was previously in another band with them called Deranged prior to knowing Grice.
Split into simpler sentences: Onslaught were formed in 1983 in Bristol, England, by guitarists Nige Rockett and Steve Grice. Vocalist Jase Pope and bassist Paul Hill were then asked to join as Rockett was previously in another band with them called Deranged prior to knowing Grice.