Simplify the following text for a Grade 7 native English-speaking person.
Original: He left Rosario-based Newell 's Old Boys 's youth team in 2000 and moved with his family to Europe , as Barcelona offered treatment for his growth hormone deficiency .
Simplified: He left Newell 's Old Boys 's youth team in 2000 and moved with his family to Europe . It 's because Barcelona offered treatment for his growth hormone deficiency .