Simplify the following text for a Grade 13 native English-speaking person.
Original: It was at Berklee where Pohjola met several of his performing and recording collaborators of the 1990s and 2000s , among them Jill Walsh , Johanna GrÃ 1\/4 ssner , Fernando Huergo , Matt Penman , Bruno RÃ berg , Roberto Dani and Mick Goodrick .
Simplified: Pohjola also met many new music collaborators , such as Johanna GrÃ 1\/4 ssner , Matt Penman , Roberto Dani , Fernando Huergo , Sophie DunÃ r and Yusuke Yamamoto .