Complex sentence: My primary role was working with data-focused co-workers to help provide robust support around the descriptions and definitions of data-which was maintained on a MediaWiki-based wiki that I administered (co-worker support, lots of writing, training, upgrades, etc.).
Split into simpler sentences: My primary role was working with data-focused co-workers to help provide robust support around the descriptions and definitions of data. The latter of which was maintained on a MediaWiki-based wiki that I administered (co-worker support, lots of writing, training, upgrades, etc.).