Complex sentence: Twin Mustangs replaced by jet F-94C Starfire interceptors in 1951; later F-86D Sabres in 1954 and F-102A Delta Daggers in 1959.
Split into simpler sentences: Twin Mustangs replaced by jet F-94C Starfire interceptors in 1951 and later toF-86D Sabres in 1954. The squadron upgraded to and F-102A Delta Daggers in 1959.