Complex sentence: The most important scientific expedition was that of Alexander von Humboldt and French botantist Aimé Bonpland, who travelled for five years throughout Spanish America (1799-1804), exploring and recording scientific information as well as the attire and lifestyles local populations.
Split into simpler sentences: The most important scientific expedition was that of Alexander von Humboldt and French botantist Aimé Bonpland. They traveled for five years throughout Spanish America (1799-1804), exploring and recording scientific information as well as the attire and lifestyles local populations.