Complex sentence: In this environment, Juba learned to dance from his peers, including "Uncle" Jim Lowe, a black jig and reel dancer who performed in the low-brow establishments frequented by blacks.
Split into simpler sentences: In this environment, Juba learned to dance from his peers. One of these was "Uncle" Jim Lowe, a black jig and reel dancer who performed in the low-brow establishments frequented by blacks.