Complex sentence: And he didn't disappoint them: after having outclassed his fellow students at the Latin school, he was sent to the University of Franeker in 1718, where he was immersed in Antiquity by Lambertus Bos and Campegius Vitringa.
Split into simpler sentences: And he did not disappoint them: after having risen to the top of his class at the Latin school, he was sent to the University of Franeker in 1718. Here, he was immersed in the study of Antiquity by Lambertus Bos and Campegius Vitringa.