Simplify the following text for a Grade 13 native English-speaking person.
Original: John Laing plc is a British developer and operator of privately financed , public sector infrastructure projects such as roads , railways , hospitals and schools through Public-Private Partnership ( PPP ) and Private Finance Initiative ( PFI ) arrangements .
Simplified: John Laing plc is a British developer and operator of privately financed , public sector infrastructure projects such as roads , railways , hospitals and schools .