Complex sentence: All nine are only shown on an IFR Low Altitude Chart and are official waypoints and should be in the Jeppesen database of an aviation GPS receiver or Flight Management System (FMS).
Split into simpler sentences: All nine are only shown on an IFR Low Altitude Chart. However, all of them are official waypoints and should be in the Jeppesen database of an aviation GPS receiver or Flight Management System (FMS).