Creating a correct sentence is not always as simple as translating the words of an English sentence and writing them in the same order in Spanish.

However, the basic sentence structure is generally the same.

Only requirement for a sentence in English and Spanish is a verb and a subject.

The subject, which is the person or thing being described or responsible for the action of the verb.

The subject in Spanish and English, which can be expressed or understood, is generally nouns and pronouns.

In Spanish, just like English, a noun is a proper name or names a person, place, thing or idea: 
         English - John, rain, man, Philadelphia, table, teacher, etc.
         Spanish - Carlos, la mesa, el amigo, la profesora, etc.

A pronoun is a word that substitutes for nouns or that is used when no noun is available: 
         English - I, they, we, him, it, you, etc.
         Spanish - él, ella, tú, usted, etc.

To determine the subject of a sentence, first isolate the verb and then make a question by placing "who?" or "what?" before it -- the answer is the subject.

The verb indicates an action or describes a state.         
         English -  speak, learn, run, is, have, seem
         Spanish -  habla, aprende, corre, es, tiene, parece

The verb is conjugated to go with the subject.

In normal word order, the subject comes before the verb.  Subject + verb + additional words
In the following sentences, the subject is in bold italics and the verb is bold.
       Isabella eats pizza everyday.  --  Isabella come la pizza todos los días.
       John is my classmate.  -- John es mi compañero de clase.

Since in Spanish the verb forms themselves usually signal what the subject is, subject pronouns are very often omitted in Spanish:
         Yo soy de España. = Soy de España. = I am from Spain.
         Sr. Lorenzo es mi profesor.  Es de España. = Mr. Lorenzo is my teacher.  (He) is from Spain.  You don't need to use the pronoun él, because everyone knows who you are talking about.

There are other parts of speech that can make a sentence more complexed.