Complex sentence: Bobby initially doesn't seem to care for anything or anyone until Miss Theobald tells her that she is cheating her parents badly.And, on learning this, Bobby starts working hard, too, though she occasionally plays tricks.
Split into simpler sentences: Bobby initially doesn't seem to care for anything or anyone until Miss Theobald tells her that she is cheating her parents badly. After learning this, Bobby starts working hard, too, though she occasionally plays tricks.