Why some aircraft carriers use two islands

Why does the Italian carrier design use two islands?

The forward island improves ship handling and visibility, while the aft island better supports aviation operations and can accommodate a second exhaust uptake.

A large carrier's bridge benefits from being near the bow, where the ship-handling team can see what lies ahead. Air operations are easier to direct from farther aft, closer to the working flight deck. A conventionally powered carrier may also need separate exhaust uptakes, making two superstructure blocks practical as well as operationally useful. The arrangement answers competing ship-control, aviation, and machinery needs.