Complex sentence: In Chicago, Blount met Alton Abraham, a precociously intelligent teenager and something of a kindred spirit who became the Arkestra's biggest booster and one of Sun Ra's closest friends.
Split into simpler sentences: In Chicago, Blount met Alton Abraham, a precociously intelligent teenager and something of a kindred spirit. He became the Arkestra's biggest booster and one of Sun Ra's closest friends.