yaghnaw
they (had) prospered
V – 3rd person masculine plural imperfect verb, jussive mood + PRON – subject pronoun waw
Root Link: غ ن ى
kafarū
disbelieved
V – 3rd person masculine plural perfect verb + PRON – subject pronoun waw
Root Link: ك ف ر
rabbahum
(in) their Lord
N – accusative masculine noun + PRON – 3rd person masculine plural object pronoun Ha
Root Link: ر ب ب