Complex sentence: Character creation, like combat, is highly granular, with 15 basic attribute scores and between 6 and 19 secondary abilities and skills, many of which have to be moderated by an Education Type attribute.
Split into simpler sentences: Character creation, like combat, is highly granular. After that there's the generation of between 6 and 19 secondary abilities and skills, many of which have to be moderated by an Education Type attribute.