What distinguishes “wa-huwa carrying tools” from a parenthetical “wa-huwa in its infancy”?

Supplementary Practice 14: Scarcity, Evidential Scope and Rhetorical Precision in Public Communication

• Only the number of letters in huwa
• Every nominal sentence must be parenthetical
• Whether it depicts a circumstance of an event or interrupts a predication with explanation
• Every wāw necessarily coordinates two independent sentences