I am passive aggressive and want to insult my boss without him finding out
CJam, 56 53 bytes

q_"DIEIINAAGGREASEFFIRE"{S@:A+S@+#:BA&lt;AB&gt;}%(!B)*\N*@?


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How it works

q_                     Read all input from STDIN and push a copy.
"DIEIINAAGGREASEFFIRE" Push the characters we're searching for in form of a
                       string. We'll try to prepend a linefeed to all of them.
                       Some characters are duplicated to prepend two linefeeds.
{                      For every character C in that string:
  S@                   Push ' ' and rotate the string on the stack on top of it.
  :A                   Save the string (initially the input) in A.
  +                    Prepend the space to A.
  S@+                  Construct the string " C".
  #                    Compute the index of " C" in the modified A.
  :B                   Save the index in the variable B.
  A&lt;                   Push the substring of A up to the index.
  AB&gt;                  Push the substring of A after the index.
}%
(                      Shift the first element of the resulting array.
!                      Compute the logical NOT. This pushes 1 if and only if the
                       array's first element is an empty string, which is true
                       if and only if the input string started with a D.
B)                     Push the last value of B and increment. If the last match
                       was successful and, therefore, all matches were successful,
                       B != -1, so B + 1 != 0.
*                      Compute the product of the two topmost items on the stack.
\                      Swap the resulting Booleanr with the array of substrings.
N*                     Join the array, separating by linefeeds.
@                      Rotate the input string on top of the stack.
?                      Select the joined array if the Boolean is 1 and the input
                       string otherwise.