Complex sentence: Bharat Bala and Kanika had been working together on various projects such as Vande Mataram (1996,1998), Desh Ka Salaam (1999) when they realised that there was not a single good rendering of the Indian National Anthem.
Split into simpler sentences: Bharat Bala and Kanika had been working together on various projects such as Vande Mataram (1996,1998), Desh Ka Salaam (1999). They realised there was not a single good rendering of the Indian National Anthem.