Complex sentence: The Media Control Interface, MCI in short, is an aging high-level API developed by Microsoft and IBM for controlling multimedia peripherals connected to a Microsoft Windows or OS/2 computer, such as CD-ROM players and audio controllers.
Split into simpler sentences: The Media Control Interface, MCI in short, is an aging API for controlling multimedia peripherals connected to a Microsoft Windows or OS/2 computer. The MCI interface is a high-level API developed by Microsoft and IBM for controlling multimedia devices, such as CD-ROM players and audio controllers.