Your first question, you want it for when you type a sentence or when a user types a sentence?

Your second question:

Code:
on *:TEXT:!names *:#channel:{
  if ($numtok($2-,44)) {
    var %idx = 0
    while (%idx < $numtok($2-,44)) {
      inc %idx
      write file.txt $gettok($2-,%idx,44)
    }
  }
}


You'll have to edit the code:
#channel - replace with an actual channel name (eg, #blah)
file.txt - replace with a filename of your choice