Simplify the following text for a Grade 7 native English-speaking person.
Original: The severe Norman west front was also rebuilt by Hugh de Goldclif -- although how is uncertain , it was very costly but its ` rapid ' weathering and later alterations have erased all but fragments .
Simplified: The severe Norman west front was rebuilt by Hugh de Goldclif . It was very costly but its rapid weathering and later alterations have removed all but fragments .