Complex sentence: After Giles'firing, Wyndam-Pryce became Buffy and Faith's Watcher for a short period of time, eventually being fired by the Watchers after Faith turned rogue and Buffy quit working for them, and moving on to assist the vampire Angel.
Split into simpler sentences: After Giles'firing, Wyndam-Pryce became Buffy and Faith's Watcher for a short period of time. He is eventually fired by the Watchers after Faith turned rogue and Buffy quit working for them, and moves on to assist the vampire Angel.