Complex sentence: On the day of the discovery, he was returning to his campsite and saw sunlight reflecting off something beneath a tree, this turned out to be the first piece of gold, which eventually led to the discovery of two gold-rich quartz reefs.
Split into simpler sentences: On the day of the discovery, he was returning to his campsite and saw sunlight reflecting off something beneath a tree, this turned out to be the first piece of gold. This eventually led to the discovery of two gold-rich quartz reefs.