The environment is the sum of all conditions and elements that make up the surroundings. Compound sentence
Compound-complex sentence
Simple sentence
Complex sentence

Compound sentence

Explanation:

A sentence can be defined as a group of words that comprises of both a subject and predicate used to convey a logical information. Sentences are classified into four (4) main categories and these includes;

I. Simple sentence.

II. Compound sentence.

III. Complex sentence.

IV. Compound-Complex sentence.

A compound sentence can be defined as a type of sentence that comprises a minimum of two independent clause which are joined together by a coordinating conjunction or semicolon. Thus, a compound sentence is made up of independent clauses having related ideas.

A coordinating conjunction can be defined as a word that is used for joining two words, phrases or sentences having similar grammatical rank and are syntactically equal.

An independent clause can be defined as a clause that expresses a complete thought while standing alone as a simple (complete) sentence and comprises at least a subject and a verb (predicate).

On a related note, each half of a compound sentence must be able to stand alone as a simple (complete) sentence. Thus, a compound sentence doesn't contain any dependent clauses.

"The environment is the sum of all conditions and elements that make up the surroundings."

Hence, the above sentence is an example of a compound sentence.