Original: The Six Day War between Arab countries and Israel, the Prague Spring and subsequent Soviet invasion of Czechoslovakia, and the Indo-Pakistani War of 1971 leading to the birth of Bangladesh all took place during his tenure as secretary-general.
Simplified: The Six Day War between Arab countries and Israel, the Prague Spring and subsequent Soviet invasion of Czechoslovakia, and the Indo-Pakistani War of 1971 leading to the birth of Bangladesh all took place during his time as Secretary-General.