Simplify the following text for a Grade 13 native English-speaking person.
Original: The National Union of Rail , Maritime and Transport Workers ( RMT union ) held a conference in January 2006 to address what it calls ` The crisis in working class representation ' , in which Socialist Party councillor and Campaign for a New Workers ' Party chair Dave Nellist was invited to speak .
Simplified: The National Union of Rail , Maritime and Transport Workers ( RMT union ) held a conference in January 2006 to address what it calls ` The crisis in working class representation ' , in which Dave Nellist was invited to speak .