Complex sentence: Edmund was buried near his grandfather Edgar at Glastonbury Abbey in Somerset, however the abbey was destroyed during the Dissolution of the Monasteries in the 16th century, any remains of a monument or crypt would have been plundered and the location of his remains is unclear.
Split into simpler sentences: Edmund was buried near his grandfather Edgar at Glastonbury Abbey in Somerset. However the abbey was destroyed during the Dissolution of the Monasteries in the 16th century, and any remains of a monument or crypt would have been plundered and the location of his remains is unclear.