Complex sentence: All spacecraft were manufactured by TRW and launched in pairs, either on an Atlas-Agena or Titan III-C boosters, and placed in 63,000 to 70,000 mile orbits, well above the Van Allen radiation belts.
Split into simpler sentences: All spacecraft were manufactured by TRW and launched in pairs, either on an Atlas-Agena or Titan III-C boosters. They were placed in orbits of 63,000 to 70,000 miles, well above the Van Allen radiation belts.