فَازَ الْفَرِيقُ. تَغَلَّبَ عَلَى مُنَافِسِهِ.
The team won; it defeated its rival.
فَازَ الْفَرِيقُ. تَدَرَّبَ طَوِيلًا.
The team won; it had trained extensively.
In the first pair the second clause reiterates or specifies what victory involved. In the second it may answer a natural question about how or why the victory occurred. Both pairs lack a coordinating wāw, yet complete connection and quasi-complete connection rest on different discourse relations.
The absence of a conjunction is only the observation to be explained. The explanatory task is to determine what the second clause contributes to the first.