Complex sentence: The new two-storey Istana is believed to have been designed by colonial architect George Drumgoole Colemanl some of its architectural features are similar to those of other buildings Coleman designed such as the Old Parliament House and the Armenian Church.
Split into simpler sentences: The new two-storey Istana is believed to be designed by colonial architect George Drumgoole Coleman. Some of its architectural features are similar to those of other buildings Coleman designed, such as the Old Parliament House and the Armenian Church.