To break a sentence add <br> tag like in example below.
to add parragraph use <p> tag.
< html > < head > < title >.
My First Page</title > < /head >
< body bgcolor=white>
Hello! Welcome to my First page.<br> This page is bla, bla, bla...
And if you wants parragraph add <p>.
Can you see the parragraph above?
Good!
< /body > < /html >