Complex sentence: The attitude here is to learn to taste differences between grapes and types of wine and with that knowledge of what in the wine the connoisseur is feeling start to appreciate the differences and thereby the beverage itself.
Split into simpler sentences: The attitude here is to learn to taste the differences between grapes and types of wine. Using the knowledge of the contents of the wine, the connoisseur starts to appreciate the differences between varieties and thereby the beverage itself.