Complex sentence: Their low cost, inherently high output and "peaked" frequency response characteristic were well suited for this application, and their use in new telephone installations continued up to the 1980s, long after they had been replaced by other types of microphones in other applications.
Split into simpler sentences: Their low cost, inherently high output and peaked frequency response characteristic were well suited for this application. Their use in new telephone installations continued into the 1980s, long after they had been replaced by other types of microphones in other applications.