What do you need help with? Also, I dont think that is a simple sentence.
Subject- The longest, most boring day of his life
Predicate- ended with a thud.
Featured snippet from the web
Bandwagon.
Loaded Words.
Testimonial.
Name-Calling.
Plain Folks.
Snob Appeal.
Misuse of Statistics.
Transfer.
C. who or what the passage is about