Simplify the following text for a Grade 10 native English-speaking person.
Original: A lorry ( 42-6452 ) containing about 440 pounds of high explosives crashed through the main gate of the Central Bank , a seaside high-rise which managed most of the financial business of the country .
Simplified: A truck with about 440 pounds ( 200kg ) of high explosives crashed through the main gate of the Central Bank , a seaside building which managed most of the financial business of the country .