original: At the height of its glory, Ani had a population of 100,000 - 200,000 people and was the rival of Constantinople, Baghdad and Cairo.
simplifications: Ani had a population of 100,000 - 200,000 people and was the rival of Constantinople, Baghdad and Cairo. Ani at it's peak had 100,000 - 200,000 people and was the competitor of Constantinople, Baghdad and Cairo. Constantinople, Baghdad and Cairo's rival Ani had 100,000 - 200,000 residents at it's height. Ani had a population of 100,000-200,000 people at its peak. Its rivals were Constantinople, Baghdad, and Cairo. At the height of its glory, Ani held 100,000 - 200,000 people. It was the rival of Constantinople, Baghdad and Cairo. At the height of its glory, Ani had a population of 100,000 - 200,000. It was the rival of Constantinople, Baghdad and Cairo. Ani had a population of 100,000 - 200,000 people  at the peek of its glory, and was the rival of Constantinople, Baghdad and Cairo. At it's peak, Ani had 100,000 - 200,000 people living in it. At the height of its glory, Ani had a population of 100,000 - 200,000 people and rivaled Constantinople, Baghdad and Cairo. At the peak of its fame, Ani had a population of 100,000 - 200,000 people, which was close to Constantinople, Baghdad and Cairo.