Complex sentence: Mary later married Jonathan Brooker and lived near the Hawkesbury River (1809), it was here that Mary raised her family which numbered 21 children, seven of which lived to have their own children.
Split into simpler sentences: Mary later married Jonathan Brooker and and they lived near the Hawkesbury River (1809). It was here that Mary raised her family which numbered 21 children, seven of which lived to have their own children.