Complex sentence: It is one of the oldest MUD clients in existence and a successor of the TINTIN client whose name according to its author stood for "The kIckiN Tickin dIkumud clieNt".
Split into simpler sentences: It is one of the oldest MUD clients in existence and a successor of the TINTIN client. According to its author, TINTIN stands for "The kIckiN Tickin dIkumud clieNt".