Complex sentence: He grew up on his mother's reservation, the Beaver Lake Cree Nation; however; he is a member of the Saddle Lake Cree Nation in Alberta and moved to New York City in May 1994.
Split into simpler sentences: He grew up on his mother's reservation, the Beaver Lake Cree Nation, but is a member of the Saddle Lake Cree Nation in Alberta. He moved to New York City in May 1994.