Complex sentence: Sibley commenced his formal painting career in Brisbane during the latter half of the 1950's alongside notable artists such as Roy Churcher, Jon Molvig and Ian Fairweather, Brian Johnston, Charles Blackman and Clifton Pugh.
Split into simpler sentences: Sibley commenced his formal painting career in Brisbane during the latter half of the 1950's alongside notable artists such as Roy Churcher, Jon Molvig and Ian Fairweather. Other notable artists that he met at this time included Brian Johnston, Charles Blackman and Clifton Pugh.