Complex sentence: As competitions became more and more common, those with a base in striking arts became more competitive as they cross trained in arts based around takedowns and submission holds, likewise, those from the varying grappling styles added striking techniques to their arsenal.
Split into simpler sentences: As competitions became more and more common, those with a base in striking arts became more competitive as they cross trained in arts based around takedowns and submission holds. Likewise, those from the varying grappling styles added striking techniques to their arsenal.