%some-extended-class {
    color:red;
}
.no-csstransforms %some-extended-class {
    color:blue;
}

.class-one {
    .class-two {
        .class-three {
            @extend %some-extended-class;
        }
    }
}

.class-one .class-two .class-three {
  color: red;
}

.no-csstransforms .class-one .class-two .class-three {
  color: blue;
}

.class-one .class-two .class-three {
  color: red;
}

.no-csstransforms .class-one .class-two .class-three, .class-one .class-two .no-csstransforms .class-three {
  color: blue;
}