Complex sentence: Eventually Japanese aircrafts did bomb Budge Budge (south of Calcutta) which led to widespread panic-over a million people fled from the city and there was a huge pressure on civic authorities to control the situation.
Split into simpler sentences: Eventually Japanese aircrafts did bomb Budge Budge (south of Calcutta). The bombing led to widespread panic-over a million people fled from the city and there was a huge pressure on civic authorities to control the situation.