Complex sentence: The halfback (HB) or tailback (TB) position is responsible for carrying the ball on the majority of running plays, and may frequently be used as a receiver on short passing plays.
Split into simpler sentences: The halfback (HB) or tailback (TB) position is often integral in both the passing and running attack. It is responsible for carrying the ball on the majority of running plays, and may frequently be used as a receiver on short passing plays.