Complex sentence: In the case of Mad, the property is owned by DC's parent company, but not DC themselves; and the licensing for the T.H.U.N.D.E.R. Agents works is now held by "IDW" as of 2012.
Split into simpler sentences: In the case of Mad, the property is owned by DC's parent company, but not DC themselves. The licensing for the T.H.U.N.D.E.R. Agents works is held by "IDW" as of 2012.