Complex sentence: Robotman is one of the founding members of the Doom Patrol along with Negative Man and Elasti-Girl and is unique in that he is the only character to appear in every version of the Doom Patrol.
Split into simpler sentences: Robotman is one of the founding members of the Doom Patrol along with Negative Man and Elasti-Girl. He is unique in that he is the only character to appear in every version of the Doom Patrol.