Complex sentence: Similarly, Level 2 players in the 2/3-the average game imagine that all other players are Level 1 players, reasoning that the average will be 33, so they in turn guess 2/3 of 33 or 22.
Split into simpler sentences: Similarly, Level 2 players in the 2/3-the average game imagine that all other players are Level 1 players. They therefore reason that the average will be 33, and so they in turn guess 2/3 of 33 or 22.