Complex sentence: There are many add-ons for the TPS-75, one of which allows the AN/TPS-75 to be tilted back to see into the atmosphere assisting in detection of long range ballistic missiles.
Split into simpler sentences: There are many add-ons for the TPS-75. One of which allows the AN/TPS-75 to be tilted back to see into the atmosphere assisting in detection of long range ballistic missiles.