Complex sentence: The Marlow-Hunter factory produces approximately 100 boats totally annually of its trailerable and cruising sailboats which includes the Downeaster styled and newly developed Marlow Mainship Pilot Series.
Split into simpler sentences: The Marlow-Hunter factory produces approximately 100 boats annually of its trailerable and cruising sailboats. Also included in this total is the Downeaster styled and newly developed Marlow Mainship Pilot Series.