Complex sentence: A MiniDrive is generally a microSD card adapter in the RS-MMC form factor, which allows a user to take advantage of the wider range of modern MMCs available to exceed the historic 2 GB limitations of older chip technology.
Split into simpler sentences: A MiniDrive is generally a microSD card adapter in the RS-MMC form factor, which allows a user to take advantage of the wider range of modern MMCs available. An MD-MMC Adapter allows a user to exceed the historic 2 GB limitations of older chip technology.