Complex sentence: From 1933 to 1973 Afghanistan witnessed a lengthy period of peace and relative stability and was ruled as a monarchy by King Zahir Shah who belonged to the Afghan Barakzai dynasty.
Split into simpler sentences: From 1933 to 1973 Afghanistan witnessed a lengthy period of peace and relative stability. It was ruled as a monarchy by King Zahir Shah who belonged to the Afghan Barakzai dynasty.