Complex sentence: Robert B. Neller is a United States Marine Corps lieutenant general who currently serves as Commander, United States Marine Corps Forces Command and United States Marine Corps Forces, Europe, and has been there since July 1,2014.
Split into simpler sentences: Robert B. Neller is a United States Marine Corps lieutenant general. He has been Commander, United States Marine Corps Forces Command and United States Marine Corps Forces, Europe, since July 1,2014.