Original: RÃ bke also said that Knut plainly misses his past father-figure, Thomas DÃ rflein, and has become so used to attention that he cries when no one is near his enclosure.
Simplified: RÃ bke also said that Knut misses Thomas DÃ rflein, who was like a father to him, and that he cries when no one is near him.