جَاءَ زَيْدٌ وَثَوْبُهُ نَظِيفٌ.
Zayd arrived while his garment was clean.
جَاءَ زَيْدٌ ثَوْبُهُ نَظِيفٌ.
Zayd arrived; his garment was clean.
In each illustration, thawbuhu naẓīfun is nominal, and the pronoun in thawbuhu points to Zayd. The first form makes the circumstantial relation overt with wāw. The second needs syntactic and contextual support to be heard as a circumstance; mere juxtaposition of two clauses does not automatically make the second a ḥāl.
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Wāw with Nominal Circumstantial Clauses: Omission, Inclusion and Disputed Cases
جَاءَ زَيْدٌ وَثَوْبُهُ نَظِيفٌ.
Zayd arrived while his garment was clean.
جَاءَ زَيْدٌ ثَوْبُهُ نَظِيفٌ.
Zayd arrived; his garment was clean.
In each illustration, thawbuhu naẓīfun is nominal, and the pronoun in thawbuhu points to Zayd. The first form makes the circumstantial relation overt with wāw. The second needs syntactic and contextual support to be heard as a circumstance; mere juxtaposition of two clauses does not automatically make the second a ḥāl.