Complex sentence: The Electoral Council met in secret on April 20,1944, and determined that the appointment of Vares as Prime Minister in 1940 was unlawful according to the 1938 constitution and elected Jüri Uluots as acting President of Estonia on April 21st.
Split into simpler sentences: The Electoral Council met in secret on April 20,1944, and determined that the appointment of Vares as Prime Minister in 1940 was unlawful according to the 1938 constitution. The Council elected Jüri Uluots as acting President of Estonia on April 21st.