Complex sentence: The Navy requested further development in order to bring the aircraft into the category of "patrol bomber", and in October 1935 the prototype was returned to Consolidated for further work, including installation of 900 hp (671 kW) R-1830-64 engines.
Split into simpler sentences: The Navy requested further development in order to bring the aircraft into the category of "patrol bomber", and in October 1935 the prototype was returned to Consolidated for further work. The work included installation of 900 hp (671 kW) R-1830-64 engines.