Complex sentence: Palgi was a co-founder of El Al and its deputy director from 1949 until 1960, and then Israel's director of civil aviation until 1964, when he was appointed ambassador to Tanzania.
Split into simpler sentences: Palgi was a co-founder of El Al and its deputy director from 1949 until 1960. Subsequently, he was Israel's director of civil aviation until 1964, when he was appointed ambassador to Tanzania.