Complex sentence: The unnamed critic in "The Manchester Guardian" referred to Johnson's "sex, snobbery and sadism" complaint, and conceded that while "the casualties take place on a somewhat narrower front than usual, they are heavy".
Split into simpler sentences: The unnamed critic in "The Manchester Guardian" referred to Johnson's "sex, snobbery and sadism" complaint. This reviewer also conceded that while "the casualties take place on a somewhat narrower front than usual, they are heavy".