Complex sentence: Their heaters, boilers, fans and accessories are fueled by recycled oil for industrial, agricultural, commercial and residential use, including waste oil heater, waste oil boiler and waste oil fan product lines.
Split into simpler sentences: Their heaters, boilers, fans and accessories are fueled by recycled oil for industrial, agricultural, commercial and residential use. Their products include waste oil heater, waste oil boiler and waste oil fan product lines.