Complex sentence: Canarsie Local is a rapid transit service of the New York City Subway, providing service along the entire length of the two-tracked BMT Canarsie Line between 8th Avenue in Chelsea, Manhattan and Rockaway Parkway in Canarsie, Brooklyn at all times.
Split into simpler sentences: Canarsie Local is a rapid transit service of the New York City Subway, providing service along the entire length of the BMT Canarsie Line. The L service operates between 8th Avenue in Chelsea, Manhattan, and Rockaway Parkway in Canarsie, Brooklyn, at all times.