Complex sentence: The Pre-Intuitionists, as defined by Brouwer, differed from the Formalist standpoint in several ways, particularly in regard to the introduction of natural numbers, or how the natural numbers are defined/denoted.
Split into simpler sentences: The Pre-Intuitionists, as defined by Brouwer, differed from the Formalist standpoint in several ways. In the introduction of natural numbers, or how the natural numbers are defined/denoted.