Complex sentence: However there have been several updates to the system to allow wide bus widths, and the current VME64 includes a full 64-bit bus in a 6U sized card, and 32-bit for 3U cards.
Split into simpler sentences: However there have been several updates to the system to allow wider bus widths. The current VME64 includes a full 64-bit bus in 6U-sized cards and 32-bit in 3U cards.