Complex sentence: Because Prussia did not recognize the Stella Matutina academy, Clemens returned home in 1894 to attend a public school in Vechta and by 1896 both Clemens and Franz had passed the examinations that qualified them to attend a university.
Split into simpler sentences: Because Prussia did not recognize the Stella Matutina academy, Clemens spent the last years of his education near home. In 1894 he returned home to attend a public school in Vechta and by 1896 both Clemens and Franz had passed the examinations that qualified them to attend a university.