Complex sentence: In the Toronto streetcar system, the Harbourfront LRT, as 604 Harbourfront began service in 1990 and ceased operation upon opening of the the Spadina Avenue separated right-of-way in 1997, when it was extended north along Spadina and renamed 510 Spadina.
Split into simpler sentences: In the Toronto, Canada, streetcar system, the Harbourfront LRT, as 604 Harbourfront, began service in 1990. It ceased operation upon opening of the the Spadina Avenue separated right-of-way in 1997, when it was extended north along Spadina and renamed 510 Spadina.