Simplify the following text for a Grade 13 native English-speaking person.
Original: In his maiden speech to Parliament in July 1987 , Livingstone used parliamentary privilege to raise a number of allegations made by Fred Holroyd , a former Special Intelligence Service operative in Northern Ireland .
Simplified: In his maiden speech to Parliament in July 1987 , Livingstone used Parliamentary privilege to raise a number of allegations made by Fred Holroyd , a former MI6 operative in Northern Ireland .