Complex sentence: Both IGN and Gamepro agreed that the adventure aspects made the game worth playing but the fighting mechanics and FPS controls (for the time) were not bad either with IGN adding they "both become more entertaining and elaborate as the game progresses".
Split into simpler sentences: Both IGN and Gamepro agreed that the adventure aspects made the game worth playing and the fighting mechanics and FPS controls (for the time) weren't bad either. IGN added "(they) both become more entertaining and elaborate as the game progresses".