In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

A federation ( also known as a federal state ) is a political entity characterized by a union of partially self-governing provinces , states , or other regions under a central federal government ( federalism ) .
A federation is a union of a number of self-governing states or regions , which are joined together under a central government .

Tuzla ( -RSB- ) is the third-largest city of Bosnia and Herzegovina and the administrative center of Tuzla Canton of the Federation of Bosnia and Herzegovina .
Tuzla is the third largest city of Bosnia and Herzegovina .

Being internally " at peace " is considered by many to be a healthy mental state , or homeostasis and to be the opposite of feeling stressful , mentally anxious , or emotionally unstable .

Being " at peace " is considered by many to be healthy and the opposite of being stressed or anxious .