Who said Sariraka Meemamsa is difficult to understand? Sri Ramacharya Swami made it so simple, even a person with no vedic knowledge can read this simple conversation between a mother and son and can understand the profound knowledge. 
Note: Chatusstri is an explanation of first 4 sutras in Sariraka Meemamsa- SriBhashyam. Bhagavad Ramanujacharya establishes Visishtadvaitam, contradicts the interpretation of other philosophies and  establishes his interpretation supported by pramanas from srutis, smritis and  puranas . Thus it is very important to read and understand. Each Adhyayam consists of 4 parts called 'Pada's.