Complex sentence: The first E- 6 made its maiden flight from Boeing's Renton Factory on 19 February 1987, when it was flown to Boeing Field, Seattle, for fitting of mission avionics, being delivered to the Navy for testing on 22 July 1988.
Split into simpler sentences: The first E- 6 made its maiden flight from Boeing's Renton Factory on 19 February 1987, when it was flown to Boeing Field, Seattle, for fitting of mission avionics. The aircraft was delivered to the Navy for testing on 22 July 1988.