Complex sentence: Her passion quickly lead her to start doing wildlife rehabilitation as a full-time career, turning her home into a makeshift rehabilitation centre, starting with a few cages in the backyard and used her spare room as a nursery.
Split into simpler sentences: Her passion quickly lead her to start doing wildlife rehabilitation as a full-time career. She promptly turned her home into a makeshift rehabilitation centre, starting with a few cages in the backyard and used her spare room as a nursery.