Complex sentence: Kennedy began playing trumpet at the age of ten and was in a teen air guitar band with then best friends Michael Murphy, Mark Terzenbach and Bruce Kidd, which at 13, he later traded for a real guitar copying the playing style of Jimmy Page.
Split into simpler sentences: Kennedy began playing trumpet at the age of ten and was in a teen air guitar band with then best friends Michael Murphy, Mark Terzenbach and Bruce Kidd at 13. He later traded for a real guitar copying the playing style of Jimmy Page.