Complex sentence: The Global Positioning System (GPS) was invented at NRL and tested by NRL prototype satellites Timation I and Timation II in 1967 and 1969, and the first operational GPS satellite, Timation IV (NTS-II) was designed and constructed at NRL.
Split into simpler sentences: The Global Positioning System (GPS) was invented at NRL and tested by NRL's Timation series of satellites. The first operational GPS satellite, Timation IV (NTS-II) was designed and constructed at NRL.