Complex sentence: Monsanto expanded to Europe in 1919 by entering a partnership with Graesser's Chemical Works at Cefn Mawr, Wales, to produce vanillin, aspirin and its raw ingredient salicylic acid and later rubber processing chemicals.
Split into simpler sentences: Monsanto expanded to Europe in 1919 in a partnership with Graesser's Chemical Works at Cefn Mawr, Wales. The venture produced vanillin, aspirin and its raw ingredient salicylic acid and later rubber processing chemicals.