Complex sentence: His mother died shortly after his birth, and he was then sent to live with his Aunt Hattie Henderson Gift and Frank Gift in Halstad, Minnesota who raised him and taught him piano, starting at the age of four.
Split into simpler sentences: His mother died shortly after his birth, and he was then sent to live with his Aunt Hattie in Halstad, Minnesota, who raised him. She taught him piano, starting at the age of four.