Complex sentence: On the following day, rapid deepening commenced, with the storm become a hurricane on that day and then peaking as a 115 mph (180 km/h) Category 3 hurricane on May 25.
Split into simpler sentences: On the following day, rapid deepening commenced, with the storm becoming a hurricane on that day. Peaking as a 115 mph (180 km/h) Category 3 hurricane on May 25.