野(や)球(きゅう) yakyuuの noボール booruが ga窓(まど) madoから kara飛(と)び()込(こ)ん()で() tobikondeきた kita。 A baseball came flying in through the window. Literal Baseball [gen-の] ball [subj-が] window [from-から] flew-in-[toward-speaker-てきた]. 飛び込んでくる is a stacked verb construction: 飛び込む ('fly in, jump in') + ~てくる ('come toward speaker'). Three layers of motion semantics in one verb. 窓から ('from the window') marks the source of entry. sportsbaseballcompound verb~てくる (motion toward speaker)
野(や)球(きゅう) yakyuuの noボール booruが ga窓(まど) madoから kara飛(と)び()込(こ)ん()で() tobikondeきた kita。 A baseball came flying in through the window. Literal Baseball [gen-の] ball [subj-が] window [from-から] flew-in-[toward-speaker-てきた]. 飛び込んでくる is a stacked verb construction: 飛び込む ('fly in, jump in') + ~てくる ('come toward speaker'). Three layers of motion semantics in one verb. 窓から ('from the window') marks the source of entry. sportsbaseballcompound verb~てくる (motion toward speaker)