How does a monster action like Attack, Move, Attack resolve in one turn?

Question

Accepted Answer

Usually only one pattern applies: an adjacent monster attacks twice without moving, while a distant one moves and attacks once. Each attack draws its own modifier, so an Attack 1 can do zero damage to a -1 modifier or Shield 1 and a later attack still hurts.

Gloomhaven: Buttons & Bugs

How does a monster action like Attack, Move, Attack resolve in one turn?