Complex sentence: The Great Dane is one of the world's tallest dog breeds; the current world record holder, measuring from paw to shoulder, is "Zeus" (died Sep.2014; Age 5).
Split into simpler sentences: The Great Dane is one of the world's tallest dog breeds. The current world record holder for tallest dog was a Great Dane, measuring from paw to shoulder, is "Zeus" (died Sep.2014; Age 5).