The service Restream.io allows split original stream to other services. See how to stream to Restream.io by WinBroadcaster.
Open WinBroadcater and press On Air and select RTMP Mode
It opens browser page for streaming. You need fill two fields.
Log in to Restream.io, found RTMP URL field and Stream Key and copy them to WinBroadcaster and press START:
After START you can see your stream in Restream.io dashboard: