Sentence:  And the more complex the morphophonemic system is in relation to the phonemic base , the less easily a phonemic system will be analysed without close attention to the morphophonemics - at least , the less satisfying will a phonemic statement be if it cannot be related through morphophonemic <WSD>rules</WSD> to grammatically meaningful structures . 
Meaning of the word marked with <WSD> tags:  (linguistics) a rule describing (or prescribing) a linguistic practice