Complex sentence: The need for more power stimulated the production of steam-powered beam engines, and rotative mill engines transmitting the power to line shafts on each floor of the mill. Surplus power capacity encouraged the construction of more sophisticated power looms working in weaving sheds.
Split into simpler sentences: The need for more power stimulated the production of steam driven beam engines, and then rotative mill engines. The line shaft transmitted this power to each floor of the mill. Surplus power capacity encouraged the construction of ever more sophisticated power looms working in weaving sheds.