“After the diligent students attended their challenging in the modern university building, they gathered in the quiet library and discussed their complex research projects with their professors, while enjoying coffee and snacks from the nearby cafe under the warm afternoon sun.”
Noun : Students, classes, building, library, projects, professors, coffee, snack, cafe, sun.
Pronoun : Their, they.
Adjective: diligent, challenging, modern, quiet, complex.
Conjunction: and, while.
Preposition: in, with, from, under.