Complex sentence: The Young BNP is a nationalistic youth movement in Great Britain, it is a department of the British National Party for youth BNP supporters and falls under the arm of the British Nationalist Youth Movement with other groups such as BNP students.
Split into simpler sentences: The Young BNP is a nationalistic youth movement in Great Britain. It is a department of the British National Party for young BNP supporters and falls under the arm of the British Nationalist Youth Movement with other groups such as BNP students.