Complex sentence: His studies took him to the library of Teylers Museum in Haarlem, and his subsequent article on the weever in the popular journal "Album der Natuur" established him as an expert on fishes.
Split into simpler sentences: His studies took him to the library of Teylers Museum in Haarlem. His subsequent article on the weever in the popular journal "Album der Natuur" establishes him as an expert on fishes.