Complex sentence: While Grubitz sees the situation as an opportunity for career advancement, Wiesler, a dedicated socialist, is horrified by the abuse of power, and gradually sees that Dreyman and Sieland are deeply in love.
Split into simpler sentences: While Grubitz sees the situation as an opportunity for career advancement, Wiesler, a dedicated socialist, is horrified by the abuse of power. Wiesler also sees that Dreyman and Sieland are deeply in love.