Complex sentence: Run was an American computer magazine published monthly by IDGE Communications with its first issue debuting in January 1984, and began publishing bi-monthly in April 1990, and ended in November/December 1992.
Split into simpler sentences: RUN was an American computer magazine published monthly by IDGE Communications with its first issue debuting in January 1984. Bi-monthly publishing began in April 1990, and went on until the magazine folded in November/December 1992.