Causes of Breast Bone Pain. 1  Heartburn or reflux is the most common cause of a burning pain along and under the breast bone as a result of esophagitis. Gastroesophageal reflux (GERD) may also result in episodes of severe sharp pains in the chest and is often mistaken for a myocardial infarction (heart attack) during these episodes.
A complex sentence contains an independent clause and at least one dependent clause. A sentence with two or more independent clauses plus (one or more) dependent clauses is referred to as a compound-complex sentence. (Every clause contains a subject and predicate).
A simple sentence usually consists of a single finite clause with a finite verb that is independent. More complex sentences may contain multiple clauses. Main clauses (matrix clauses, independent clauses) are those that can stand alone as a sentence.