What is sentence?
A sentence is a group of words that expresses a complete thought. Always capitalize the first word in a sentence and use end punctuation carefully.

Kinds of Sentence

1. Simple Sentence
    A simple sentence has one subject and one verb, either or both of which may be compound.

    Thomas Jefferson wrote hundreds of letters.
    His journals and notes still attract and influence readers.

2. Compound Sentence
    A compound sentence consists of two or more simple sentences. Join simple sentences with the conjunction and, but, or with a semicolon. Put a comma before the conjunction in a compound sentence unless the sentence is very short.

    Jefferson ran for President in 1796, but John Adams won the election.
    Adams tried and he succeeded.

3. Complex Sentence
    A complex sentence has one independent clause and at least one subordinate clause.

    When Jefferson ran for President once more in 1800, he won.