Complex sentence: Compared to alternatives such as regenerative furnaces, initial costs are lesser, there are no valves to be switching back and forth, there are no inner-diameter fans and it does not require a web of gas ducts spread up all over the furnace.
Split into simpler sentences: Compared to alternatives such as regenerative furnaces, initial costs are lesser adn there are no valves to be switching back and forth. No ID fan and it does not require a web of gas ducts spread up all over the furnace.