夜(や)中(ちゅう) yachuuに ni雨(あめ) ameが ga降(ふ)っ()た() futtaので node道(みち) michiが gaたいへん taihen悪(わる)か()っ()た() warukatta。 It rained during the night, so the road was very bad. Literal Night-middle [at-に] rain [subj-が] fell-[because-ので] road [subj-が] terribly was-bad. ~ので is a reason conjunction — softer and more explanatory than から, which is more direct. のでは indicates an objective/observed reason rather than a subjective justification. たいへん ('very, greatly') is adverbial, intensifying the following adjective. nightweather~ので (because)
夜(や)中(ちゅう) yachuuに ni雨(あめ) ameが ga降(ふ)っ()た() futtaので node道(みち) michiが gaたいへん taihen悪(わる)か()っ()た() warukatta。 It rained during the night, so the road was very bad. Literal Night-middle [at-に] rain [subj-が] fell-[because-ので] road [subj-が] terribly was-bad. ~ので is a reason conjunction — softer and more explanatory than から, which is more direct. のでは indicates an objective/observed reason rather than a subjective justification. たいへん ('very, greatly') is adverbial, intensifying the following adjective. nightweather~ので (because)