Complex sentence: During the summer of 1955 the 128th was re-designated as the 128th Fighter Interceptor Squadron and converted the swept-wing F-84F Thunderstreak.
Split into simpler sentences: During the summer of 1955 the 128th was re-designated as the 128th Fighter Interceptor Squadron and converted to F-84Fs. The F-84Ds were replaced by the swept-wing F-84F Thunderstreak.