You will be given a definition of a task first, then some input of the task.
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

A Pipe bomb is a kind of explosive bomb .
Output:
A pipe bomb is an improvised explosive device , which uses a tightly sealed section of pipe filled with an explosive material .