Complex sentence: Its thermal protection system (TPS) is an ablative tile created by NASA's Ames center that would be replaced as a large group rather than tile by tile, and would only need to be replaced after several flights.
Split into simpler sentences: Its thermal protection system (TPS) is a material that is being worked on with NASA's Ames center, it is a tile with an ablative coating. The TPS would be replaced as a large group rather than tile by tile, and would only need to be replaced after several flights.