Complex sentence: By the later Middle Ages, the tetramorphs were used less frequently and the Evangelists were often shown in their human forms accompanied by their symbolic creatures, or as human men with the heads of animals.
Split into simpler sentences: By the later Middle Ages, the tetramorph in the form of creatures was used less frequently. Instead, the Evangelists were often shown in their human forms accompanied by their symbolic creatures, or as men with the heads of animals.