Complex sentence: In mid- 1992, a GCI-Tanzanian team investigated this by opening a three-by-three meter trench which showed that root growth had in fact done damage to the footprints.
Split into simpler sentences: In mid- 1992, a GCI-Tanzanian team wanted to investigate this. They opened a three-by-three meter trench, which showed that root growth had done damage to the footprints.