It means that his business was at the back of no 72 Sherlock St, but his home was at Peter's place in John St, which is off Mosely Road. White;s directories did this , combining the business and home addresses in one list, whereas Kellys & the PO directories had separate lists. If you go to John St on the Street list , then it has(Moseley Road) after it, meaning that it is off Moseley Road, while going down the list of properties James Prince, cowkeeper, is listed as at St Peters Place, which would have been a terrace off the Street