Simplify the following text for a Grade 6 native English-speaking person.
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 .