Simplify the following text for a Grade 6 native English-speaking person.
Original: In November 2007 and weighing over 90 kg ( 198 lb ) , Knut was deemed too dangerous for close handling and his interaction with human handlers was further diminished .
Simplified: In November 2007 , Knut weighed over 90 kg ( 198 lb ) and became too dangerous to be cared for closely .