According to Osho, nothing happened between your last life and this one. There is only a bodiless gap where no events occur, because happenings require a body. In that interval you are either unconscious (no memory) or conscious (you remember only emptiness). Hence the question “what happened?” doesn’t apply—there were no happenings, only awareness or oblivion.
Between lives there’s just a quiet pause with no events; if you were awake you’d notice the silence, if asleep you’d notice nothing.