Complex sentence: After two months of planning, Bonaparte decided France's naval power was not yet strong enough to confront the Royal Navy in the English Channel and proposed a military expedition to seize Egypt and thereby undermine Britain's access to its trade interests in India.
Split into simpler sentences: After two months of planning, Bonaparte decided France's naval power was not yet strong enough to confront the Royal Navy. He decided on a military expedition to seize Egypt and thereby undermine Britain's access to its trade interests in India.