6 A few art collectors Tames Bowdoin III of Boston，William Byrd of Virginia，and the Aliens 夫婦 and Hamiltons 夫婦 of Philadelphia introduced European art traditions to those colonists
Privileged特權 to visit their galleries，especially aspiring 抱負的 established in their respective communities社群 the idea of the value of art and the need for institutions機構 devoted to its encouragement.
(A few art collectors…introduced European art traditions to those colonists…and established…the idea…and the need…為句子主幹)
幾個藝術收藏家，波士頓的詹姆士·鮑德溫三世、弗吉尼亞的威廉·白爾德租費城的阿里昂夫婦以及漢密爾頓夫婦將歐洲藝術傳統介紹給那些被特許參觀他們畫廊的殖民者，尤其是有抱負的藝術家們，並在他們各自的社群形成了藝術有價值和需要設立機構以鼓勵其發展的觀念。
分析：
此長句全為主句，沒有從句。整句只能找主幹與修飾部分，不能分 art collectors introduced traditions to those colonists and established in the idea of the value of art and the need for institutions
修飾成分：
(1)幾個人名並列：Tames Bowdoin III of Boston，William Byrd of Virginia，and the Aliens and Hamiltons of Philadelphia
(2)非謂語動詞字尾修飾名詞：privileged to visit their galleries修飾colonists
devoted to its encouragement修飾institutions
(3)插入語 ，especially aspiring artists.
(4)介詞短語修飾謂語動詞：in their respective communities 修飾 established