Complex sentence: However, the US Governnent sent another super-powered agent after them, and, despite the best efforts of the Doom Patrol, the Brotherhood members were killed and the painting destroyed, presumably killing the members who had elected to remain there.
Split into simpler sentences: However, the US Governnent sent another super-powered agent after them. Despite the best efforts of the Doom Patrol, the Brotherhood members were killed and the painting destroyed, presumably killing the members who had elected to remain there.