Complex sentence: Wesley, who had been working on a project involving microscopic nanites, realizes that he may have inadvertently let two nanites from his experiments loose; the nanites were programmed to find ways to work together and evolve.
Split into simpler sentences: Wesley, who had been working on a project involving microscopic nanites, realizes that he may have inadvertently let two nanites from his experiments loose. The nanites were programmed to find ways to work together and evolve.