Complex sentence: Hair gels resist natural protein conformations and allow hair to be styled and textured, because the stretched-out polymer takes up more space than a coiled polymer and thus resists the flow of solvent molecules around it.
Split into simpler sentences: Hair gels resist natural protein conformations and allow hair to be styled and textured. This is because the stretched-out polymer takes up more space than a coiled polymer and thus resists the flow of solvent molecules around it.