To simplify the expression, we need to follow the order of operations, which is parentheses, exponents, multiplication and division (from left to right), and addition and subtraction (from left to right).

First, let's simplify what's inside the parentheses:
(-13 + 30) = 17

Now, we can substitute this value back into the expression:
(1) - 15 - 17

Next, we can perform the subtraction from left to right:
1 - 15 = -14

Finally, we can perform the last subtraction:
-14 - 17 = -31

Therefore, the simplified expression is -31.