Complex sentence: On the morning of 25 June, the Soviet Union launched an air offensive of 460 fighters and bombers targeting 19 airfields in Finland; however, inaccurate intelligence and poor bombing accuracy caused several raids to hit Finnish cities or municipalities.
Split into simpler sentences: On the morning of 25 June, the Soviet Union launched an air offensive of 460 fighters and bombers targeting 19 airfields in Finland. However, inaccurate intelligence and poor bombing accuracy caused several raids to hit Finnish cities or municipalities.