Complex sentence: Former Music-Hall act'Flatfoot' Mason (Frank Randle) works as a caretaker at a school where one of the pupils is secretly his daughter Betty (Terry Randall), who unbeknownst to her was put up for adoption when his wife died.
Split into simpler sentences: Former Music-Hall act'Flatfoot' Mason (Frank Randle) presently works as a school caretaker. One of the pupils at his school is secretly his daughter Betty (Terry Randall), who unbeknownst to her was put up for adoption when his wife died.