"there must be an easier way to do this." marlin said, tangled up in cords and wires. fragment or punctuated correctly

That would be a fragment, as there should be a comma in between the quotation marks and 'this', indicating that the speech cam directly from the speaker. (aka Marlin)

the police rob enrique and other migrants and they deport them back

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.