Complex sentence: Cantwell also developed triple deckers on adjacent lots on Darling and Sachem Streets, and in 1890 subdivided the lot on which the Hoxie House stood and built triple-deckers at 17 and 19 Sachem Street.
Split into simpler sentences: Cantwell also developed triple deckers on adjacent lots on Darling and Sachem Streets. In 1890, he subdivided the lot on which the Hoxie House stood and built triple-deckers at 17 and 19 Sachem Street.