Complex sentence: This range is a combined horst, forearc high and accretionary wedge structure and was separated from the Andes during the Tertiary rise of the Andes due to the subsidence of the Intermediate Depression.
Split into simpler sentences: This range is a combined horst, forearc high and accretionary wedge structure. The range was separated from the Andes during the Tertiary rise of the Andes due to the subsidence of the Intermediate Depression.