Complex sentence: The following section will describe the distinct achievements of each of these individuals, and will describe their respective roles in facilitating the development of a coherent theory of classical conditioning that would emerge within the early twentieth century and form the foundation of the emerging psychological behaviourist movement.
Split into simpler sentences: The following section details the distinct achievements of each of these individuals, and provided is a description of their respective roles in facilitating the development of a coherent theory of classical conditioning. This theory would later emerge, within the early twentieth century, and form the foundation of the emerging psychological behaviourist movement.