In the first sentence, delete have. (This isn’t because have is Bad Writing — seriously, stop telling new writers that! — but because it isn’t necessary, and because it implies things that don’t fit with the rest of the paragraph.)
Typo alert: change was’nt to wasn’t.
Change the comma after science to a period or semicolon.
Typo alert: change Maybeits to Maybe it’s.
Delete the comma after events.
Change your (possessive form of you) to you’re (contraction of you are).
You invented time travel, but it wasn’t to advance science. It was for passion. Passion that you’ve had for a long time. Maybe it’s to kill, marry, see events or wonders… or maybe you’re extremely petty.
(I haven’t invented time travel, but clearly I am extremely petty. Look at me, offering advice on grammar and whatnot to people who want such advice. This kind of behavior shows both an unhealthy obsession with trivia — imagine any real adult caring about clear communication! — and a strong tendency toward authoritarianism. It should be illegal!)