Complex sentence: Aircraft could be dealt with by means of simple air-traffic control restrictions, but impacts by space objects (in particular, by meteoroids and micrometeorites) pose a more difficult problem that could be a show-stopper for construction of a space elevator.
Split into simpler sentences: Aircraft could be dealt with by means of simple air-traffic control restrictions. Impacts by space objects such as meteoroids and micrometeorites pose a more difficult problem for construction and operation of a space elevator.