Do you have an exact specification of how the data is formatted? Does it use a termination character (like an End Of Line)?
First, you need to make sure you have a full message. If the device uses a termination character, then use that and set the number of bytes to read in the VISA Read to something a lot larger than you expect to read. It will stop when it finds the termination character.
From there, it looks like you just have a comma separated value string. Try using the Spreadsheet String To Array function with a comma as the delimiter. You can then use Index Array to pick off the values you care about to feed them to wherever you need them.