Complex sentence: Of 12 nests that were knocked down by birds that had satellites, 66.7% of the colony survived by moving to the satellite, compared to the reproductive success of nests with no satellite that were attacked (5.7%).
Split into simpler sentences: Of 12 nests that were knocked down by birds that had satellites, 66.7% of the colony survived by moving to the satellite. This is compared to the reproductive success of nests with no satellite that were attacked (5.7%).