Complex sentence: It is undoubtly one of the most visited places in Aragon, also because of the many gardens and waterfalls created by the river in the Piedra (Stone) Canyon that have become a place of rest and recreation for tourists.
Split into simpler sentences: It is undoubtly one of the most visited places in Aragon because of the many gardens and waterfalls created by the river located in the Piedra (Stone) Canyon. This attraction has become a place of rest and recreation for tourists.