At C1 level, academic and professional English relies heavily on dense noun phrases that pack multiple layers of information into a single noun group. Mastering pre-modification (adjectives, participles, compound modifiers) and post-modification (prepositional phrases, relative clauses, participle clauses) allows you to write with the precision and conciseness expected in formal registers.
Practice tip: When you see a long sentence with multiple relative clauses, try compressing each clause into a modifier. If it sounds natural before the noun, use pre-modification. If it needs to follow the noun, use a reduced participle phrase.