Complex sentence: Briggs noticed that there were many differences in personality with Clarence Myers compared to other men in her family and began researching personality types and with this developed four types: meditative, spontaneous, executive, sociable.
Split into simpler sentences: Briggs noticed that there were many differences in personality with Clarence Myers compared to other men in her family and began researching personality types. From this Katharine developed four types: meditative, spontaneous, executive, sociable.