Bess Crawford is the main character
They are describing colonel pickering from pygmalion, a play by george bernard shaw.
Answer: He is not sane... He killed a man only because his eye bothered him. Then he hid him under the floorboards. The only way he could possibly be sane is because he confessed to the police when he could've gotten away. He did the right thing in the end but I would still consider him insane.
Explanation:
This is a compound sentence because you can break it into two sentences.
Hope this helps
Prepositions ususally stand before nouns, in this case "on" is the preposition.
