Complex sentence: Gus Kohntopp is an A- 10 Thunderbolt II (A- 10) fighter pilot with the Idaho Air National Guard of the United States (U.S.) with which he holds the rank of colonel and is a commercial pilot with Southwest Airlines.
Split into simpler sentences: Gus Kohntopp is an A- 10 Thunderbolt II (A- 10) fighter pilot with the Idaho Air National Guard of the United States (U.S.). He currently holds the rank of colonel and is also a commercial pilot with Southwest Airlines.