Complex sentence: Anoop Kannan made his directorial debut in 2012 through the Mammootty starrer "Jawan of Vellimala", which is the debut film of Mammootty as a producer.
Split into simpler sentences: Anoop Kannan made his directorial debut in 2012 through the Mammootty starrer "Jawan of Vellimala". It should be noted that "Jawan of Vellimala" is the debut film of Mammootty as a producer.