Answer
See below.
Work Step by Step
The negation of $ p\rightarrow q$ is $p\land \sim q$.
De Morgan's Laws says that $\sim (p\land q)\equiv \sim p\lor \sim q$ and $\sim (p\lor q)\equiv \sim p\land \sim q$.
Thus here the negation is: $p\land \sim(\sim r\lor s)\equiv p\land ( r \land \sim s)$