Complex sentence: Large numbers of fuel pumps were manufactured by the company for Rolls Royce Merlin engines, and in 1940 the fuel pump for Britains first jet engine was also supplied by Plessey.
Split into simpler sentences: Large numbers of fuel pumps were manufactured by the company for Rolls Royce Merlin engines. In 1940 the fuel pump for Britains first jet engine was also supplied by Plessey.