Complex sentence: Meanwhile, the younger children burst in fury and stand up against the bullies by fighting them, and when the principal tells Tom about the incident between the younger children and the bullies, Tom grounds the younger children from any fun and games.
Split into simpler sentences: Meanwhile, the younger children burst in fury and stand up against the bullies by fighting them. When the principal tells Tom about the incident between his children and the bullies, Tom grounds the younger children from any fun and games.