Complex sentence: He was briefly re-signed by D.C. in March 2008 to a developmental contract, but released not long after, whereupon he joined the Vancouver Whitecaps in the USL.
Split into simpler sentences: He was briefly re-signed by D.C. in March 2008 to a developmental contract, but released not long after. Following his release, he joined the Vancouver Whitecaps in the USL.