Complex sentence: In 2007--08, Perera scored 15 league goals for a Galician squad that failed to return to the top level--he would immediately move teams again, joining Rayo Vallecano.
Split into simpler sentences: In 2007--08, Perera scored 15 league goals for a Galician squad that failed to return to the top flight. He would immediately move teams again, joining Rayo Vallecano.