Complex sentence: Long-time second to Viswanathan Anand-helping him in the 2008,2010 and 2012 World Championship matches-he has also trained with Sergey Karjakin and Fabiano Caruana.
Split into simpler sentences: Long-time second to Viswanathan Anand, helping him in the 2008,2010 and 2012 World Championship matches. He has also trained with Sergey Karjakin and Fabiano Caruana.