Sentence:  The severe yet harmonious vases of the previous fifty years , the Strong Geometric style of the late ninth century , display as firm a mastery of the principles underlying Geometric pottery ; but artists now were ready to refine and <WSD>elaborate</WSD> their inheritance . 
Meaning of the word marked with <WSD> tags:  add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing