Complex sentence: The Ayutthaya historical park covers the ruins of the old city of Ayutthaya, Thailand, which was founded by King Ramathibodi I in 1350 and was the capital of the country until its destruction by the Burmese army in 1767.
Split into simpler sentences: The Ayutthaya historical park covers the ruins of the old city of Ayutthaya, Thailand. The city of Ayutthaya was founded by King Ramathibodi I in 1350 and was the capital of the country until its destruction by the Burmese army in 1767.