Complex sentence: The lads' culture is also patriarchal and racist, as girls and non-Whites are excluded from their informal group; it also strongly identifies with the actual, working-class environment from which it originates.
Split into simpler sentences: The lads' culture is also patriarchal and racist, as girls and non-Whites are excluded from their informal group. It also strongly identifies with the actual, working-class environment from which it originates.