Complex sentence: The quilt has little coffins with names of Hatfields sewn on them, as they die their coffin is moved to the center of the quilt and the date they died is sewn under their name.
Split into simpler sentences: The quilt has little coffins with names of Hatfields sewn on them. As the Hatfields die their coffin is moved to the center of the quilt and the date they died is sewn under their name.