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.

In flail chest multiple ribs are broken move independently of the rib cage .
Chest wall injuries include rib fractures and flail chest , in which multiple ribs are broken so that a segment of the ribcage is detached from the rest of the chest wall and moves independently .

The California Polytechnic State University is a public university .
California Polytechnic State University ( also known as California Polytechnic State University , San Luis Obispo , Cal Poly San Luis Obispo , or Cal Poly ) is a public university in San Luis Obispo , California .

The Middle Triassic is the second of three epochs of the Triassic period .

In the geologic timescale , the Middle Triassic is the second of three epochs of the Triassic period or the middle of three series in which the Triassic system is divided .

