Complex sentence: He put a slightly modified version of this engine into a motorcycle and called it "Das Kleine Wunder"-- "the little wonder" the intials from this becoming the DKW brand: by the late 1920s, DKW was the world's largest motorcycle manufacturer.
Split into simpler sentences: He put a slightly modified version of this engine into a motorcycle and called it "Das Kleine Wunder"-- "the little wonder". This was the beginning of the DKW brand: by the 1930s, DKW was the world's largest motorcycle manufacturer.