Complex sentence: Lincoln greeted Green amicably at first, however, Green refused to shake Lincoln's hand when it was offered, and then proceeded to verbally berate him, calling him a tyrant and a murderer and accusing him of starting the Civil War.
Split into simpler sentences: Lincoln greeted Green amicably at first, however, Green did not reciprocate in kind, refusing to shake Lincoln's hand when it was offered. Green then proceeded to verbally berate him, calling him a tyrant and a murderer and accusing him of starting the Civil War.