Complex sentence: At first, Joffrey is kind and polite to Sansa, however refuses to show sympathy with the family when Bran Stark falls from a tower, this makes Joffrey's uncle Tyrion have to physically punish him until he shows respect.
Split into simpler sentences: At first, Joffrey is kind and polite to Sansa. However, he refuses to show sympathy with the family when Bran Stark falls from a tower; this makes Joffrey's uncle Tyrion have to physically punish him until he shows respect.