tābū
repent
V – 3rd person masculine plural perfect verb + PRON – subject pronoun waw
Root Link: ت و ب
wa-aṣlaḥū
and reform[ed] themselves
CONJ – prefixed conjunction wa (and) + V – 3rd person masculine plural (form IV) perfect verb + PRON – subject pronoun waw
Root Link: ص ل ح
fa-inna
Then indeed
REM – prefixed resumption particle fa + ACC – accusative particle inna
Root Link: ا ن ن