Complex sentence: Zeppelin airships attacked the town in World War I, and Nazi air raids caused damage and death in World War II. Throughout the 20th century, industry declined and services and tourism played an increasing role in the economy.
Split into simpler sentences: Zeppelin airships attacked the town in WW1, and Nazi air raids caused damage and death in WW2. Thruout the 20th century, industry declined and services and tourism played an increasing role in the economy.