Complex sentence: A DNA test later revealed that Di's DNA did in fact match J.R.'s, although it really only proved that they were close blood relatives because an actual confirmed DNA sample of Dixie before her accident was unavailable.
Split into simpler sentences: A DNA test later reveals that Di's DNA does, in fact, match J.R.'s, although it really only proves that they are close blood relatives. An actual DNA sample of Dixie before her accident was unavailable.