Complex sentence: He wants to stop the marriage, and at Anand's suggestion Rambabu and Sambasiva Rao ask Veerasamy to have his henchmen kill the bridegroom; this would stop the marriage on the last day of the four-week deadline imposed by Sambasiva Rao.
Split into simpler sentences: He wants to stop the marriage and upon Anand's suggestion, Rambabu and Sambasiva Rao request Veerasamy send his henchmen to kill the bridegroom. This would halt the marriage on the last day of the four week deadline imposed by Sambasiva Rao.