The source's first component states: «طلوع الشمس علة لوجود النهار»
The sun's rising is a cause of the existence of daylight.
The other component is itself a connected conditional: “Whenever the sun rises, daylight exists.” Structurally:
Antecedent: Sunrise is a cause of daylight — categorical.
Consequent: If sunrise occurs, daylight exists — connected conditional.
The outer “if … then …” therefore gives a categorical → connected construction.