Complex sentence: Dorothy Catalonia is the grandaughter of Duke Dermail of The Romefeller Foundation, is the second cousin of Treize Khushrenada, and is as a representative of Romefeller sent to the Sanc Kingdom where she meets Relena Peacecraft.
Split into simpler sentences: Dorothy Catalonia is the grandaughter of Duke Dermail of The Romefeller Foundation, and is the second cousin of Treize Khushrenada. As a representative of Romefeller, she is sent to the Sanc Kingdom where she meets Relena Peacecraft.