Complex sentence: Allers, however, received Katzenberg's decision positively as an opportunity for "a lot of newer animators... to step up to leadership roles"--among them was Andreas Deja, who became Scar's supervising animator.
Split into simpler sentences: Allers, however, received Katzenberg's decision positively as an opportunity for "a lot of newer animators... to step up to leadership roles". Among them was animator Andreas Deja, who became Scar's supervising animator.