Final answer:
Brom Bones played tricks on Ichabod Crane and mocked him, which led to him marrying Katrina while Ichabod Crane left the town.
Step-by-step explanation:
Between Brom and Katrina, Brom Bones played practical jokes on Ichabod Crane and ridiculed him in front of Katrina. Brom Bones eventually married Katrina, while Ichabod Crane left the town. He changed his location, continued his work as a school teacher, studied law, became a politician, and was eventually made a justice of the Ten Pound Court.