Complex sentence: John Learie Estrada (born September 27,1955) is the current United States Ambassador to Trinidad and Tobago and a former U.S. Marine who served as the 15th Sergeant Major of the U.S. Marine Corps from 2003 to 2007.
Split into simpler sentences: John Learie Estrada (born September 27,1955) is the current United States Ambassador to Trinidad and Tobago. He is also a former United States Marine who served as the 15th Sergeant Major of the U.S. Marine Corps from 2003 to 2007.