Complex sentence: At the age of 19, Mathis became pregnant and chose to move in with her mother to have her child, a girl named Bonnie Blue Broad, born on 21st August 1989.
Split into simpler sentences: At the age of 19, Mathis became pregnant and chose to move in with her mother to have her child. Mathis had a child, a girl named Bonnie Blue Broad, born on 21 August 1989.