Complex sentence: J.K. Rowling has stated that after book 7, she married Neville Longbottom and became the new land lady at the Leaky Cauldron after Tom.
Split into simpler sentences: J.K. Rowling has stated that after book 7, she married Neville Longbottom and became the new land lady at the Leaky Cauldron. She becomes the new landlady of the Leaky Cauldron after Tom.