Complex sentence: Their founding mainstay was Colin Hay on lead vocals; he formed the group with Jerry Speiser on drums; and Ron Strykert on lead guitar; they were joined by Greg Ham on flute and keyboards; and then John Rees on bass guitar.
Split into simpler sentences: Their founding mainstay was Colin Hay on lead vocals; he formed the group with Jerry Speiser on drums and Ron Strykert on lead guitar. They were joined by Greg Ham on flute and keyboards and then John Rees on bass guitar.