Simplify the following text for a Grade 5 native English-speaking person.
Original: In 1899 the conduit system was replaced by overhead wires and in 1900 the line was extended north to Gynn Square where it linked up with the Blackpool & Fleetwood Tramroad .
Simplified: The conduit system was changed to overhead wires in 1899 . In 1900 the line was built more to the north to Gynn Square .