Complex sentence: The open-minded Gabriel Narutowicz was elected president constitutionally (without a popular vote) by the National Assembly in 1922, however members of the nationalist right wing faction did not regard his elevation as legitimate.
Split into simpler sentences: The open-minded Gabriel Narutowicz was elected president constitutionally (without a popular vote) by the National Assembly in 1922. However, members of the nationalist right-wing faction did not regard his elevation as legitimate.