Complex sentence: The POP system was extended to the 510 Spadina route coinciding with the launch of the first brand new streetcars entering service on August 31,2014, the 504 King streetcar route followed on January 1,2015.
Split into simpler sentences: The POP system was extended to the 510 Spadina route coinciding with the launch of the first new streetcars entering service on August 31,2014. The 504 King streetcar route followed on January 1,2015.