Complex sentence: West Marine merged with E&B Marine in 1996 to target a larger customer base of power boat enthusiasts and in 2003, acquired BoatU.S. and has since become over three times as large as their nearest competitor.
Split into simpler sentences: West Marine merged with E&B Marine in 1996 to target a larger customer base of power boat enthusiasts. In 2003 they acquired BoatU.S. and have since grown over three times as large as their nearest competitor.