Complex sentence: Used simply as a novel type of general-purpose microphone, this hollowed-out version of the pallophotophone proved to be very problematic, and in 1927 Brunswick abandoned it in favor of the ordinary carbon and condenser microphones being used by its competitors.
Split into simpler sentences: Used simply as a novel type of general-purpose microphone, this hollowed-out version of the pallophotophone proved to be very problematic. In 1927, Brunswick abandoned it in favor of the ordinary carbon and condenser microphones being used by its competitors.