Sentence:  And the more complex the morphophonemic system is in relation to the phonemic <WSD>base</WSD> , 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 rules to grammatically meaningful structures . 
Meaning of the word marked with <WSD> tags:  the fundamental assumptions from which something is begun or developed or calculated or explained