Complex sentence: At first, the use of his disc records was leased to various toy companies, which made toy phonographs or gramophones to play them on; the audio fidelity of these earliest discs was well below that of contemporary phonograph cylinder records.
Split into simpler sentences: At first, the use of his disc records was leased to various toy companies, which made toy phonographs or gramophones to play them on. The audio fidelity of these earliest discs was well below that of contemporary phonograph cylinder records.