Complex sentence: Rees R and Sydney Jones extended their former premises in 1966-7 to cope with expanded staff numbers, but in 1975 decided to relocate their business to the former Queensland National Bank premises on the corner of Quay and Denham Streets.
Split into simpler sentences: Rees R and Sydney Jones extended their former premises in 1966-7 to cope with expanded staff numbers. The firm Rees and Sydney Jones moved to the former Queensland National Bank premises on the corner of Quay and Denham Streets.