Complex sentence: On a safety kick, the kicking team kicks the ball from their own 20-yard line; they can punt, drop kick or place kick the ball, but a tee is not allowed to be used in professional play.
Split into simpler sentences: On a safety kick, the kicking team kicks the ball from their own 20-yard line. They can punt, drop-kick or place-kick the ball, but a tee may not be used in professional play.