Generated by SassMeister.com.

SassMeister-input.sass

// ----
// Sass (v3.3.14)
// Compass (v1.0.1)
// ----

.object
  &
    color: red
  &__element
    padding: 20px
  &--modifier
    color: blue
  &--modifier &__element
    padding: 40px

SassMeister-output.css

.object {
  color: red;
}
.object__element {
  padding: 20px;
}
.object--modifier {
  color: blue;
}
.object--modifier .object__element {
  padding: 40px;
}