The Longest Sentence in English Poetry is in Sri Aurobindo's "Savitri"

The
longest sentence in English poetry—143 words and, if a compound is counted as
two, 144—is in Savitri, Book IV, Conto III,
P.426.



     
We must understand, of course, that true sentence-length does not really depend
on putting a full-stop as late as possible and substituting commas and
semi-colons and colons for it wherever we can. The true length is organic. The
construction is such