John-wa ainugo-o kenkyuu no sai, Mary-wa suwahirigo-o tyoosa no sai, ronbun-o kaita.
John-TOP Ainu-ACC research GEN occasion, Mary-TOP Swahili-ACC survey GEN occasion, paper-ACC wrote
John wrote a paper on the occasion of his study of Ainu and Mary did so on the occasion of her survey of Swahili.