Complex sentence: It became the 510 Spadina and replaced the 77 Spadina bus when a new dedicated right-of-way was opened in 1997, which extended the track north along Spadina Avenue from Queens Quay to Spadina station on the Bloor subway line.
Split into simpler sentences: It became the 510 Spadina and replaced the 77 Spadina bus when a new dedicated right-of-way was opened in 1997. The right-of-way extended the track north along Spadina Avenue from Queens Quay to Spadina station on the Bloor subway line.