Complex sentence: According to the Web service-ReliableMessaging (WS-RM) specification which is implemented by Sandesha2, reliable communication happens between two endpoints named the RM Source (RMS) and the RM Destination (RMD).
Split into simpler sentences: According to the Web service-ReliableMessaging (WS-RM) specification which is implemented by Sandesha2, reliable communication happens between two endpoints. These endpoints are called the RM Source (RMS) and the RM Destination (RMD).