Complex sentence: Whilst still in school at the age of 12, Daykin founded his first business, RS2Services, which sold game accounts and virtual currency to fans of fantasy role-playing game Runescape.
Split into simpler sentences: Whilst still in school at the age of 12, Daykin founded his first business. His start-up, RS2Services, sold game accounts and virtual currency to fans of fantasy role-playing game Runescape.