Complex sentence: The building's original use as a cable-car powerhouse for the Baltimore City Passenger Railway Company from 1892 to 1898 played an important role in Baltimore's transportation history as cable-car mass transit was developed to replace the horse-car.
Split into simpler sentences: The building's original use as a cable-car powerhouse for the Baltimore City Passenger Railway Company from 1892 to 1898 played an important role in Baltimore's transportation history. Cable-car mass transit was developed to replace the horse-car.