Complex sentence: Steerforth is said to be the only boy at the school bold enough to stand up to Mr Creakle, the school's strict headmaster, and to make Mr Creakle feel intimidated.
Split into simpler sentences: Steerforth is said to be the only boy at the school bold enough to stand up to Mr Creakle, the school's strict headmaster. He is also regarded as the only boy at the school bold enough to make Mr Creakle feel intimidated.