Machu Pichu could have been discovered countries ago, but it was not found until 1911. 1.This is an example of a compound sentence
2.This is an example of a simple sentence
3.This is an example of a complex sentence 4.This is an example of a compound-complex sentence

Compound-Complex sentence

Explanation:

The example is far more detailed than a compound and simple sentence because it provides more than 1 fact and the sentence is conjoined by a comma which makes it a compound-complex sentence.

his tongue, i believe, was bloody and hanging out of his mouth.

he looked as if he were hungry.

he has several wolf-like qualities; a gray coat, sharp claws and yellow fangs.

those eyes made me feel, dear reader, like the end was near.

as i reached for a stick, he moved to the other side of the hill.

panting and hungry, he looked at me, a defenseless human and he snarled.

well i said my prayers, however, he simply turned and limped off.