Complex sentence: Through Jewett's efforts, PAXCON got the contract to protect the U.S. Pentagon and many other government and military buildings and helped to write the specifications, procedures, and install a 7-layer composite system.
Split into simpler sentences: Through Jewett's efforts, PAXCON got the contract to reinforce the U.S. Pentagon and many other government and military buildings. He helped to write the specifications, procedures, and install a 7-layer composite system.