Complex sentence: The occurrence of a fecalith in the appendix was thought to be attributed to a right-sided fecal retention reservoir in the colon and a prolonged transit time, although a prolonged transit time was not observed in subsequent studies.
Split into simpler sentences: The occurrence of a fecalith in the appendix was thought to be attributed to a right-sided fecal retention reservoir in the colon and a prolonged transit time. However a prolonged transit time was not observed in subsequent studies.