Complex sentence: A new stylus invented by Keller made possible the first high-fidelity musical recordings after he worked with sound engineer, Irad S. Rafuse and their ideas led the way for single-groove stereo records.
Split into simpler sentences: A new stylus invented by Keller made possible the first high-fidelity musical recordings after he worked with sound engineer, Irad S. Rafuse. This led the way for single-groove stereo records.