Complex sentence: Lagin was a pioneer in the development and use in real-time stage and studio performance of minicomputers driving real time digital to analog converters, doing digital signal processing to generate music, in the era before digital synthesizers appeared on the market.
Split into simpler sentences: Lagin was a pioneer in the development and use of minicomputers in real-time stage and studio performance. This included running analogue to digital converters and doing digital signal processing to generate music in the era before digital synthesizers appeared on the market.