Oraciones complejas y simples en ingles?

When he handed in his homework, he forgot to give the teacher the last page.

The teacher returned the homework after she noticed the error.

The students are studying because they have a test tomorrow.

. After they finished studying, Juan and Maria went to the movies.

Juan and Maria went to the movies after they finished studying.

There are dreams that cannot die.

Though the music was quite long, it was absorbing.

The expert who examined this scroll said that it was more than one thousand years old.