Complex sentence: Only one test missile silo was built in the UK at RAF Spadeadam and with the cancellation of the Blue Streak project, the UK ICBM nuclear missile capability was transferred in 1960 to submarines; however the idea of the underground rocket bunker was adopted by the USA.
Split into simpler sentences: Only one test missile silo was built in the UK at RAF Spadeadam and with the cancellation of the Blue Streak project. In 1960 the UK ICBM nuclear missile capability was transferred to submarines, however the idea of the underground rocket bunker was adopted by the USA.