Complex sentence: At the time of Russ's injury, however, Russ and his wife had no children, so Russ, responding to Maris's enthusiasm, trained her and then granted her the right to wear his wings.
Split into simpler sentences: At the time of Russ's injury, however, Russ and his wife had no children. So Russ, responding to Maris's enthusiasm, trained her and then granted her the right to wear his wings.