Complex sentence: In one account, the writer said that Mrs. Griner claimed Lewis acted strangely the night before his death; that during dinner, Lewis stood and paced about the room talking to himself in the way one would speak to a lawyer.
Split into simpler sentences: In one account, the writer said that Mrs. Grinder claimed Lewis acted strangely the night before his death. She said that during dinner, Lewis stood and paced about the room talking to himself in the way one would speak to a lawyer.