Complex sentence: Humphries was a tactical instructor with the Advanced HRT (Hostage Rescue Team) Instructors program at Eastern Michigan University and at Gunsite Training Center near Paulden, Arizona.
Split into simpler sentences: Humphries was a tactical instructor with the Advanced HRT (Hostage Rescue Team) Instructors program at Eastern Michigan University. He was also a tactical instructor at Gunsite Training Center near Paulden, Arizona.