Complex sentence: Brisbane's tram system remained in private hands until 1922 when the Queensland government established the Brisbane Tramways Trust, compulsorily acquiring the tram network and supporting infrastructure, then in 1925 creating the Brisbane City Council and transferring responsibility for the tram network to the council.
Split into simpler sentences: Brisbane's tram system remained in private hands until 1922, at which time the Queensland government established the Brisbane Tramways Trust, which compulsorily acquired the tram network and supporting infrastructure. In 1925 the state government created the Brisbane City Council and transferred responsibility for the tram network from the trust to the council.