فِيهَا سُرُرٌۭ مَّرْفُوعَةٌۭ
Sentence structure
فِيهَا is the fronted predicate and سُرُرٌ the delayed topic. مَّرْفُوعَةٌ is its nominative adjective.
Ayah summary
Raised couches will be spread there.
فِيهَا — Therein
Grammar: A prepositional phrase serving as the fronted predicate; attached هَا is genitive.
سُرُرٌۭ — (will be) thrones
Grammar: An indefinite broken-plural nominative delayed topic.
مَّرْفُوعَةٌۭ — raised high
Grammar: An indefinite feminine-singular nominative passive-participle adjective of سُرُرٌ.