Simplify the following text for a Grade 10 native English-speaking person.
Original: He changed coaches in the summer of 2007 when he moved to the Ice Vault Arena in Wayne , New Jersey and began working with Galina Zmievskaya , who previously coached Weir 's idol Oksana Baiul . Zmievskaya 's son-in-law and Olympic gold medallist Viktor Petrenko acts as Weir 's assistant coach , and her daughter Nina Petrenko is one of his choreographers .
Simplified: After that season he switched coaches to Galina Zmievskaya , who previously coached Viktor Petrenko and Oksana Baiul to Olympic gold medals .