Complex sentence: The principal enemy of ala is the dragon; he is able to defeat her and eliminate her harmful effect: the winged dragons are thus seen as guardians of the fields and the harvest against the bad weather.
Split into simpler sentences: The principal enemy of ala is the dragon; he is able to defeat her and eliminate her harmful effect. For this reason, the winged dragons are seen as guardians of the fields and the harvest against the bad weather.