Complex sentence: Traditionally sushi rolls are wrapped with nori on the outside, but Mashita also eventually made the roll "inside-out", i.e. uramaki, because Americans did not like seeing and chewing the nori on the outside of the roll.
Split into simpler sentences: Traditionally sushi rolls are wrapped with nori on the outside. But Mashita also eventually made the roll "inside-out", i.e. uramaki, because Americans did not like seeing and chewing the nori on the outside of the roll.