«زيد أبوه قائم»
Zayd's father is standing.
The presence of more than one noun or an internal relation does not automatically mean that two independent propositions have been asserted. The sentence makes one complete judgment concerning the standing of Zayd's father.
The commentary considers an analysis in which removing a linking element leaves a simple concept “Zayd” and another expression such as “his father is standing,” which has propositional form. We must distinguish an internally complex expression from the complete judgment actually made.