Complex sentence: From 1961 to 1970 the 51 Squadron operated also five T-33 AN Silver Star aircraft; having also operated Fiat G-91 R4 from November of 1965 to 1974, which were used in the transition of pilots to operate in the Portuguese African colonies.
Split into simpler sentences: From 1961 to 1970 51 Squadron also operated five T-33 AN Silver Star aircraft; having also operated the Fiat G-91 R4 from November 1965 to 1974. They were used in the transition of pilots operating in the Portuguese African colonies.