Complex sentence: Alice Longbottom is a fictional character in the "Harry Potter" book series; she is the mother of Neville Longbottom, a Gryffindor boy in the same year as Harry Potter at Hogwarts.
Split into simpler sentences: Alice Longbottom is a fictional character in the "Harry Potter" book series. She is the mother of Neville Longbottom, a Gryffindor boy in the same year as Harry Potter at Hogwarts.