Complex sentence: Gardner retired from the U.S. Navy in October 1990 and accepted a position with TRW Inc. in Colorado Springs, being placed as a program manager in the Colorado Springs Engineering Operations of TRW's Space and Defense Sector.
Split into simpler sentences: Gardner retired from the U.S. Navy in October 1990 and accepted a position with TRW Inc. in Colorado Springs. He is a program manager in the Colorado Springs Engineering Operations of TRW's Space and Defense Sector.