Complex sentence: After the set amount of time the biomolecules will have migrated different distances based on their size; smaller biomolecules will have traveled farther down the gel, while larger ones will have remained closer to the point of origin.
Split into simpler sentences: After the set amount of time, the biomolecules have migrated different distances based on their size. Smaller biomolecules travel farther down the gel, while larger ones remain closer to the point of origin.