Complex sentence: CMLL did not promote the most recent La Sombra as having any relation to the previous incarnations at all, although it was later subtly acknowledged relationship was acknowledged when La Sombra began wrestling in a black and silver version of his father's mask.
Split into simpler sentences: CMLL did not promote the most recent La Sombra as having any relation to the previous incarnations at all. His family relationship was acknowledged as he began wrestling in a black and silver version of his father's mask.