Complex sentence: Like quarks, leptons are fermions (spin-particles) and are subject to the electromagnetic force, the gravitational force, and weak interaction, but unlike quarks, leptons do not participate in the strong interaction.
Split into simpler sentences: Like quarks, leptons are fermions (spin-particles) and are subject to the electromagnetic force, the gravitational force, and weak interaction. But unlike quarks, leptons do not participate in the strong interaction.