Complex sentence: They generally achieve this by incorporating a tiny diaphragm to reduce low frequencies, together with absorbent or damping material for high frequencies, and so can be quite costly, being intended for constant re-use unlike simple earplugs which are disposable.
Split into simpler sentences: They generally achieve this by incorporating a tiny diaphragm to reduce low frequencies, together with absorbent or damping material for high frequencies. This means they can be quite costly, being intended for constant re-use unlike simple earplugs which are disposable.