Complex sentence: Power was increased to 40 hp in 1952, marked by the renaming of the van as the D3B, and in February 1953, for drivers who did not like to work alone, a passenger seat was fitted.
Split into simpler sentences: Power was increased to 40 hp in 1952, marked by the renaming of the van as the D3B. In February 1953, for drivers who did not like to work alone, a passenger seat was fitted.