Simplify the following text for a Grade 9 native English-speaking person.
Original: Once they arrive at the factory , they are lead to a security scanner , which surreptitiously collects their DNA to transfer to an `` Archetype '' ( Thomas Knight ) under the supervision of the factory 's owner , Mrs Wormwood ( Samantha Bond ) .
Simplified: When they arrive , a guard takes them to a security scanner . The scanner takes their DNA and transfers it to `` the Archetype '' ( Thomas Knight ) whilst being watched by Mrs Wormwood ( Samantha Bond ) .