Complex sentence: Option 3 was to restructure VH-71 program to provide 19 Increment I aircraft to replace current fleet; the additional cost for this option was estimated at $5.6B and the entry into service by 2012.
Split into simpler sentences: Option 3 was to restructure VH-71 program to provide 19 Increment I aircraft to replace current fleet. The Additional cost for this option was estimated at $5.6B and the entry into service by 2012.