Complex sentence: The latest generation of cards include the information in printed letters, but the content is only accessible by physically cutting open the card, which reveals an emergency code that provides the medical professional access to a read-only web profile describing the card holder.
Split into simpler sentences: The latest generation of cards include the information in printed letters, but is only accessible by physically cutting open the card. This also reveals an emergency code that allows the medical professional access to a read-only web profile describing the card holder.