Complex sentence: Benjamin Brown (September 23,1756-September 17,1831) was an American politician who served in the United States Congress as a Representative from Massachusetts (Maine was a part of Massachusetts until 1820).
Split into simpler sentences: Benjamin Brown (September 23,1756-September 17,1831) was an American politician. He served in the United States Congress as a Representative from Massachusetts (Maine was a part of Massachusetts until 1820).