Complex sentence: Sarmd's father dies as Sarmad had planned to put poison in Neelam's tea but father drinks it and dies and on seeing this Neelam kills herself by taking the poison too.
Split into simpler sentences: Sarmd's father dies as Sarmad had planned to add poison in Neelam's tea but father drinks it and dies. On seeing this Neelam kills herself by taking the poison too.