Complex sentence: Ward intends the show's world to have a certain physical logic instead of "cartoony slapstick"; even though magic exists in the story, the show's writers try to create an internal consistency in how the characters interact with the world.
Split into simpler sentences: Ward intends the show's world to have a certain physical logic instead of "cartoony slapstick". As a result, even though magic exists in the story, the show's writers try to create an internal consistency in how the characters interact with the world.