Complex sentence: "Walla Zaman Ya Selahy" was first written for Umm Kalthoum, who was considered by many as the number one female singer of that period, the song gained a great deal of popularity in 1956, and was finally adopted as the national anthem in 1960.
Split into simpler sentences: Walla Zaman Ya Selahy was first written for Umm Kulthum, who was considered by many as the most popular female singer of that period. The song gained a great deal of popularity in 1956, and was adopted as the national anthem in 1960.