Complex sentence: Alternatively, heat-sensitive components can be built into the rigging to automatically close this curtain in case of fire and finally it may be released electronically by a building's fire control system if any alarm box is operated.
Split into simpler sentences: Alternatively, heat-sensitive components can be built into the rigging to automatically close this curtain in case of fire. Finally, it may be released electronically by a building's fire control system if any alarm box is operated.