Complex sentence: That is, they are not analytic activities wherein deep properties of existence are revealed and applied; instead, logic and math are the application of internally consistent methods to realize more complex mental constructs (really, a kind of game).
Split into simpler sentences: That is, they are not analytic activities wherein deep properties of existence are revealed and applied. Instead, logic and mathematics are the application of internally consistent methods to realize more complex mental constructs (really, a kind of game).