Complex sentence: For National Museums Liverpool's Eight Hundred Lives project, Morrissey wrote that the house had been in his family since around the turn of the twentieth century; his grandmother had been married there and his mother born there.
Split into simpler sentences: For National Museums Liverpool's Eight Hundred Lives project, Morrissey wrote that the house had been in his family since around the turn of the twentieth century. His grandmother had been married there and his mother born there.