Complex sentence: These negotiators and Jevdet Bey wanted to test the loyalty of the Van Armenians and to see once again (first one was at Armenian congress) if they agree to stage an uprising in the Russian Armenia.
Split into simpler sentences: These negotiators and Jevdet Bey wanted to test the loyalty of the Van Armenians. They wanted to see once again (first one was at Armenian congress) if they agree to stage an uprising in the Russian Armenia.