The strong man was a side-show attraction who performed feats of great strength. The side shows typically featured human oddities such as the bearded lady or the dog-faced boy. An extremely short person ( a midget) would usually be part of the show. 5 feet 5 inches (about 165cm) is the height of a somewhat shorter than average person. Much too tall to be considered a midget.
The sentence is:
The midget is five feet five inches tall.
This poem is about what a poor-quality circus this is.