Rampant urbanization wipes out valuable resting spots, which forces them to fly further than they normally would, often well past reasonable thresholds of endurance.
밑줄 친 문장의 구조가 어떻게 되나요?
which forces them to fly 와 병렬이면서 and to가 생략된 구문인가요?~ often well (and to) past reasonable~