Complex sentence: He met Hilarie Sidney, whom he later married (although years later, they divorced), Jim McIntyre and Chris Parfitt, who soon formed the indie pop band The Apples (which was later changed to The Apples in Stereo).
Split into simpler sentences: He met Hilarie Sidney, whom he later married (although years later, they divorced). With some other musicians, they formed the indie pop band The Apples (which was changed to The Apples in Stereo).