Complex sentence: Ollantaytambo located in the department of Cusco makes up a chain of small villages along the Urubamba Valley also known as the Sacred Valley of the Incas, was an important stronghold of the Incan Empire.
Split into simpler sentences: Ollantaytambo located in the department of Cusco makes up a chain of small villages along the Urubamba Valley. Also known as the Sacred Valley of the Incas, it was an important stronghold of the Incan Empire.