Complex sentence: Apart from prime number theory, we made substantial contributions to the theory of transcendental number theory, in which, he is best known for his proof of the six exponentials theorem, which is done independently of Serge Lang.
Split into simpler sentences: Apart from prime number theory, we made substantial contributions to the theory of transcendental number theory. He is best known for his proof of the six exponentials theorem, which is done independently of Serge Lang.