Complex sentence: He was nominated by both radicals such as Benjamin Flanders and moderates such as Michael Hahn to be Lt. Governor and he was quite progressive, but he retained a conservative opposition to rights for African-Americans.
Split into simpler sentences: He was nominated by both radicals such as Benjamin Flanders and moderates such as Michael Hahn to be Lt. Governor. Although progressive, he retained a conservative opposition to rights for African-Americans.