Complex sentence: Although raised in a non-religious household, he pressured his mother to let him get a bar mitzvah and moved to Montreal with his natural father for a year; and then spent the next several years shuttling between California, Canada, and Florida.
Split into simpler sentences: Although raised in a non-religious household, he decided to study for his Bar Mitzvah and obtaining his mother's permission, moved to live with his father in Montreal for a year. He then spent the next several years shuttling between California, Canada, and Florida.