The immense monument it would have been the largest in Egypt had it been completed fractured along a fault line and was abandoned in 1500 b.c.
The monument was completed in 1352 BC. 
mnli hypothesis: The monument was completed in 1352 BC.  premise: The immense monument it would have been the largest in Egypt had it been completed fractured along a fault line and was abandoned in 1500 b.c.