Complex sentence: The model for the character of Charlie was a German Shepherd, appropriately named Burt, who often spent time with the animators at the studio, even going with them during the studio's move to Ireland.
Split into simpler sentences: The model for the character of Charlie was a German Shepherd, appropriately named Burt. Burt the dog often spent time with the animators at the studio, even going with them during the studio's move to Ireland.