Complex sentence: In 1905 they requested architectural design proposals for a future palace to be submitted to the panel consisting of two architects from Saint Petersburg, famous Vienna architect Otto Wagner, and Belgrade architects Andra Stevanović and Nikola Nestorović.
Split into simpler sentences: In 1905 they requested architectural design proposals for a future palace to be submitted. The panel consisting of two architects from Saint Petersburg, famous Vienna architect Otto Wagner, and Belgrade architects Andra Stevanović and Nikola Nestorović.