Complex sentence: In order to avoid introducing water deep into the interior of the mound, this was carried out in high summer, and as quickly as possible, but in parallel with the repair work, teams of archaeologists studied the evidence that was being revealed.
Split into simpler sentences: In order to avoid introducing water deep into the interior of the mound, this was carried out in high summer, and as quickly as possible. In parallel with the repair work, teams of archaeologists studied the evidence that was being revealed.