Complex sentence: These entered service on the route on 29 January 1994, making the route the first in Britain to be run entirely with low-floor vehicles, as comparable vehicles previously delivered to Merseyside PTE and Tayside Buses had been used along side step-entrance vehicles.
Split into simpler sentences: These entered service on the route on 29 January 1994, making the route the first to be converted. This made the 120 the first route in Britain to be run entirely with low-floor vehicles, as vehicles previously delivered to Merseyside PTE and Tayside Buses had been used in conjunction with step-entrance vehicles.