Complex sentence: This type of system seems to be more problematic, as water interacting with onstage lighting circuits can cause fire, continuous operation requires that the theatre remain powered, and accidental activation of this system is widespread-causing millions of dollars of damage every year.
Split into simpler sentences: This type of system can be problematic, as water interacting with onstage electrical circuits can cause fire. Accidental activation of this system is widespread, causing millions of dollars of damage every year.