这是诗歌形式，为了没一行押韵，做了特殊的断句，每一行都以大写字母开头，尽管未必是一个句子的开头。改为散文格式则为：

It 形式主语 seems系词 a reasonable thing表语 to say what their condition was不定式短语作真正主语, (it was) 省略的主语和系词（it指代their condition) the full array of each of them表语, as it appeared to me比较分句（即传统语法所说的as引导的非限制性定语从句，修饰it was the full array of each of them这个分句）.