Complex sentence: Following the release of Air Ministry Specification F.7/30 for a single-seat day and night fighter, eight different companies proposed 12 different designs and three, including Blackburn Aircraft, received contracts to produce a prototype.
Split into simpler sentences: Following the release of Air Ministry Specification F.7/30 for a single-seat day and night fighter. Eight different companies proposed twelve different designs and three, including Blackburn Aircraft, received contracts to produce a prototype.