Complex sentence: Andiron was killed by a "brunnmigi" while the two boys were playing near a well; because Hearth was unable to hear the monster and thus save his brother, Alderman held him accountable for Andiron's death and forced Hearth to pay a wergild.
Split into simpler sentences: Andiron was killed by a "brunnmigi" while the two boys were playing near a well. Because Hearth was unable to hear the monster and save his brother, Alderman held him accountable for Andiron's death and forced Hearth to pay a wergild.