Complex sentence: Ecgric was a member of the Wuffingas royal family, but his exact descent is not known, as the only information historians have is from Bede, who named him as Sigeberht's "cognatus" or' kinsman'.
Split into simpler sentences: Ecgric was a member of the Wuffingas royal family, but his exact descent is not known. Bede named him as Sigeberht's "cognatus" or' kinsman'.