Complex sentence: In June 2006,200 U.S. Marine Corps reservists arrived to Feodosiya in Crimea to take part in the "Sea Breeze 2006" Ukraine-NATO military exercise involving troops from sixteen countries.
Split into simpler sentences: In June 2006,200 U.S. Marine Corps reservists arrived to Feodosiya in Crimea. Their mission was to take part in the "Sea Breeze 2006" Ukraine-NATO military exercise involving troops from sixteen countries.