Complex sentence: DMI 2.0 introduced in 2011 doubles the transfer rate to 20 Gbit/s with a × 4 link, it links an Intel CPU with the Intel Platform Controller Hub (which supersedes the historic Northbridge/Southbridge implementation).
Split into simpler sentences: DMI 2.0 introduced in 2011 doubles the transfer rate to 20 Gbit/s with a × 4 link. It is used to link an Intel CPU with the Intel Platform Controller Hub (which supersedes the historic Northbridge/Southbridge implementation).