Complex sentence: Mustang bought Qmodem from The Forbin Project in 1992 and renamed it to Qmodem Pro. Qmodem Pro was a DOS-based communications program, intended for use by computer users to dial into BBS systems.
Split into simpler sentences: Mustang bought Qmodem from The Forbin Project in 1992 and renamed it to QmodemPro. QmodemPro was a DOS-based communications program, intended for use by computer users to dial into BBS systems.