Billy is a descendant of the earl of lancaster

The sentence above is a simple sentence.

Explanation

The sentence above is a simple sentence because it contains only one independent clause. Simple sentences have no dependent clauses. Moreover, they are also called clausal sentences and they may have modifiers besides a subject, a verb, and an object. On the contrary, compound sentences join two or more independent clauses with a coordinator such as for, and, but, or a semi-colon.

the correct order is:

you're your own worst enemy:

they're going to say what they say, but

their opinions aren't holding you

back. it's your self-defeatist

attitude that's keeping your work

from getting its due.

it provides a unique and personal perspective on a significant historical event.