Complex sentence: Harry, Hermione, and Ron disapparate to London, where they are attacked in a diner by Death Eaters, and forced to seek refuge at 12 Grimmauld Place.
Split into simpler sentences: Harry, Hermione, and Ron disapparate to London, where they are attacked in a diner by Death Eaters. The trio are forced to seek refuge at 12 Grimmauld Place.