Complex sentence: After studying at the Boston Latin School, William Langer attended Harvard University then, fluent in the German language, took a job teaching German Worcester Academy while continuing to further his own education with courses on international relations at Clark University.
Split into simpler sentences: After studying at the Boston Latin School, William Langer attended Harvard University. Being fluent in German, he then taught German at Worcester Academy while furthering his own education with courses on international relations at Clark University.