Original: During the Six-Day War of 1967, the Israelis captured Egypt's Sinai Peninsula all the way to the Suez Canal, which became the cease-fire line, and roughly half of Syria's Golan Heights. On June 19, 1967, the National Unity Government of Israel voted unanimously to return the Sinai to Egypt and the Golan Heights to Syria in return for peace agreements.
Simplified: The Sinai and the Golan Heights belonged to Egypt and Syria, but they were occupied by Israel since 1967.