Complex sentence: Work on the engine began in 1884, and continued into 1885, when it was deemed a financial failure, and Watson decided to work with his business partner Frank O. Wellington on ship building, creating the Fore River Engine Company.
Split into simpler sentences: Work on the engine began in 1884, and continued into 1885, when it was deemed a financial failure. At this point, Watson decided to work with his business partner Frank O. Wellington on ship building, creating the Fore River Engine Company.