Complex sentence: Starting on 1 February 2009, the Cospas-Sarsat System stopped processing signals from the deprecated 121.5 MHz and 243 MHz beacons; now only signals from 406 MHz beacons are processed.
Split into simpler sentences: Starting on 1 February 2009, the Cospas-Sarsat System stopped processing signals from the anachronistic 121.5 MHz and 243 MHz beacons. Now only signals from 406 MHz beacons are processed.