The expression you've provided is:

-y^{-z^{-xy}} + 1 + 3xy + 2y - 3x^{-5} + xy + 3xy - z^

It seems like there might be some typos or missing components, particularly with the placement of exponents and terms like z^. Could you clarify if this is exactly what you intended, or should any corrections be made?

Here's how the expression is interpreted:

$-y^{-z^{-xy}} + 1 + 3xy + 2y - 3x^{-5} + xy + 3xy - z$

If this is what you meant, I can proceed with simplifying it. Otherwise, please confirm the correct expression.

Clarified Expression: $-y^{-z^{-xy}} + 1 + 3xy + 2y - 3x^{-5} + xy + 3xy - z$

Let's simplify it step by step:

1. Combine like terms involving $xy$, $y$, and constants.
2. Simplify any exponents if possible.

Would you like to clarify the expression or proceed with this interpretation?