Complex sentence: As previously noted, the Welsh word "twrch" means "wild boar, hog, mole", so Twrch Trwyth means "the boar Trwyth".
Split into simpler sentences: As previously noted, the term "twrch" in Welsh, denotes "wild boar, hog, mole". So Twrch Trwyth means "the boar Trwyth".