Complex sentence: Bertie tries, unsuccessfully, to fend off Stilton with a cosh, though Stilton forgets about Bertie and Florence when he sees Daphne Dolores Morehead and falls for her.
Split into simpler sentences: Bertie tries, unsuccessfully, to fend off Stilton with a cosh. However, Stilton forgets about Bertie and Florence when he sees Daphne Dolores Morehead and falls for her.