Complex sentence: When the station was opened with the rest of the Piccadilly railway on December 15,1906 it was known as Dover Street; the name was changed when the entrance moved to accommodate new escalators in 1933.
Split into simpler sentences: When the station was opened with the rest of the Piccadilly railway on December 15,1906 it was known as Dover Street. The name was changed when the entrance moved to accommodate new escalators in 1933.