63．The acute，growing public awareness of the social changes that had been takingplace for some time was tied to tremendous growth in popular journalism in thelate nineteenth century，including growth in quantity and circulation of both magazines andnewspapers．

(awareness…was tied to tremendous growth…为句子主干)

公众对一段时间内一直在发生的社会变化敏锐的、不断增强的意识，与19世纪晚期通俗新闻的巨大增长(包括杂志和报纸在数量和发行量上的增长)紧密相连。

分句1.The acute，growing public awareness of the socialchanges was tied to tremendous growth in popular journalism in the latenineteenth century

分句2. had beentaking place for some time

分句3.includinggrowth in quantity and circulation of both magazines and newspapers

1和2嵌套

1和3嵌套

分句1是句子主干，分句2是分句1的同位语从句，分句3including现在分词是分句1中修饰tremendousgrowth的定语。