Simplify the following text for a Grade 5 native English-speaking person.
Original: Edexcel , a UK company , is one of England , Wales and Northern Ireland 's five main examination boards , and is wholly owned by the private-sector Pearson PLC , a UK-based media and publishing conglomerate .
Simplified: It is one of England , Wales and Northern Ireland 's five main examination boards . Edexcel is owned by the private-sector Pearson PLC. .