Complex sentence: A pullback motor (also "pull back" or "pull-back") is a simple clockwork motor used in toy cars invented by Bertrand'Fred' Francis and patented in 1952 as a keyless clockwork motor.
Split into simpler sentences: A pullback motor (also "pull back" or "pull-back") is a simple clockwork motor used in toy cars. A patent for them was granted to Bertrand'Fred' Francis in 1952 as a keyless clockwork motor.