Complex sentence: The IJA's need to supplement their tank units with artillery led to a need for self-propelled guns (SPGs), subsequently, the Type 97 chassis was utilized to manufacture nearly a hundred SPGs, consisting primarily of 75 mm guns.
Split into simpler sentences: The IJA's need to supplement their tank units with artillery led to a need for self-propelled guns (SPGs). Subsequently, the Type 97 chassis was utilized to manufacture nearly a hundred SPGs, consisting primarily of 75 mm guns.