Complex sentence: While the original game was based on dialogues and asking about information in order to obtain some background information, in the new interface, the dialogues had a treefold system; a menu about the topics to be asked to the character.
Split into simpler sentences: While the original game was based on dialogues and asking about information in order to obtain some background information, in the new interface, the dialogues had a treefold system. That means a menu about the topics to be asked to the character.