Complex sentence: Ampullary organs are more sensitive and tuned to a "low frequency range" of 1--10 Hz, which is the range of non-electrogenic, biological source of electricity; therefore, ampullary organs are mainly used for passive electrolocation.
Split into simpler sentences: Ampullary organs are more sensitive and tuned to a "low frequency range" of 1--10Hz, which is the range of non-electrogenic, biological source of electricity. Therefore, ampullary organs are mainly used for passive electrolocation.