Complex sentence: The Velvet Glove radar-guided missile had been under development with the RCAF for some time, but was proven unsuitable for supersonic speeds and lacked development potential, consequently further work on that project was cancelled in 1956.
Split into simpler sentences: The Velvet Glove radar-guided missile had been under development with the RCAF for some time, but was proven unsuitable for supersonic speeds and lacked development potential. Consequently, further work on that project was cancelled in 1956.