“swathes of the country” is a noun phrase (NP). “swathes” is the head noun.
This head is post-modified by “of the country”. This phrase is a prepositional phrase (PP) with head “of” and “compliment “the country”.
“the country” is NP with head “country” and determiner “the”.
(NP (NP swathes) (PP of (NP the country)))
The NP is embedded in the PP and the PP is embedded in the top-most NP.