Complex sentence: He's no businessman, just her financial support; although he's pliable enough for her ambition, that ambition has driven him into becoming merely the sickly, wheelchair-bound tool of her insatiable greed.
Split into simpler sentences: He's no businessman, just her financial support. And although he's pliable enough for her ambition; that ambition has driven him into becoming merely the sickly, wheelchair-bound tool of her insatiable greed.