He rescues Luke Skywalker, R2-D2, and C3PO from the Tusken Raiders, and discovers that R2-D2 and C-3PO escaped Princess Leia's ship to prevent the Death Star's plans from being recovered.
He rescues Luke Skywalker from the Tusken Raiders. He rescues R2-D2 from the Tusken Raiders. He rescues C3PO from the Tusken Raiders. R2-D2 and C-3PO escaped Princess Leia's ship to prevent the Death Star's plans from being recovered. He discovers this.