、。
He heard a strange noise and jumped out of bed.
Literal
Strange sound [subject-が] was-audible [because-ので], he [topic-は] bed [from-から] jumped-out.
飛び出す literally means 'to fly out' — a vivid compound verb conveying the urgency of leaping from bed. ので connects the cause (hearing the noise) to the reaction. The contrast between the involuntary 聞こえた (heard) and the deliberate 飛び出した (jumped out) is structurally interesting.