Complex sentence: The use of microcomputers quickly increased, with 85% of school districts using them by 1981 compared to 75% for time-sharing, and the Cyber 73 shut down in 1983.
Split into simpler sentences: The use of microcomputers quickly increased, with 85% of school districts using them by 1981 compared to 75% for time-sharing. As demand for time-sharing decreased, the Cyber 73 shut down in 1983.