Complex sentence: On November 25, Wilson returned to Washington D.C. for the opening of Congress and was able to preside over the Senate from December 1, through December 9, but he was unable to speak.
Split into simpler sentences: On November 25, Wilson returned to Washington D.C. for the opening of Congress. Wilson was able to preside over the Senate from December 1, through December 9, but he was unable to speak.