Changing syslog message received

I'm getting a syslog from Cisco ACS and it reads like this on Kiwi:

Dec  1 18:44:56 10.16.162.129- sv-chof-acs01.na.bluecap123.net  CisACS_01_PassedAuth 1as18p83x 1 0 User-Name=pete,Access Device=SW-CHCL-EXC2

I would like to edit this message to omit some of the garbage I don't care about and display something like this: 

PassedAuth -  User-Name=pete,Access Device=SW-CHCL-EXC2

Does anyone know of a way to modify incoming syslog messages?

Any help would be appreciated. 

Pete