Complex sentence: Valiasr Street, the tree-lined large street that cuts the metropolis of Tehran into the western and eastern parts was built by Reza Shah Pahlavi and called the Pahlavi Street.
Split into simpler sentences: Valiasr Street, the tree-lined large street that cuts the metropolis of Tehran into the western and eastern parts. The street was built by Reza Shah Pahlavi and called the Pahlavi Street.