Complex sentence: The United Kingdom's intention in World War II was to use "desensitised" RDX: in the original Woolwich process RDX coated with beeswax, but changed to a RDX coated with petroleum-based product, based on the work carried out at Bruceton.
Split into simpler sentences: The United Kingdom's intention in World War II was to use "desensitised" RDX. In the original Woolwich process, RDX was desensitised with beeswax, but later RDX was desensitized with a petroleum-based product based on the work carried out at Bruceton.