Complex sentence: However, none of the chroniclers aboard mentions any such discovery; all say the ship returned to Spain up the coast of South America, and there is not a shred of positive evidence to support the discovery of the Falkland Islands.
Split into simpler sentences: However, none of the chroniclers aboard mentions any such discovery. All say the ship returned to Spain up the coast of South America, and there is not a shred of positive evidence to support the discovery of the Falkland Islands.