Complex sentence: These people are usually retired pro-Beijing aged men, or infamously known as indigenous communists, who gather in Victoria Park on Sundays noon, when City Forum-a public forum which is sponsored and broadcasted to public by Radio Television Hong Kong-is held.
Split into simpler sentences: These people are usually retired pro-Beijing aged men, or infamously known as indigenous communists. They gather in Victoria Park on Sundays at noon, when City Forum-a public forum which is sponsored and broadcast to the public by Radio Television Hong Kong-is held.