Complex sentence: Ham is first mentioned in a charter of 931, in which King Æthelstan granted land to his thegn Wulfgar; the latter willed the estate to his wife and then to the Old Minster, Winchester.
Split into simpler sentences: Ham is first mentioned in a charter of 931, in which King Æthelstan granted land to his thegn Wulfgar. Wulfgar willed the estate to his wife and then to the Old Minster, Winchester.