I'm not going to vote until you correct your grammar:
The correct way to spell it is
1. Satoshi's an individual who started bitcoins on it's own.
Options
1. Satoshi is an indivudual who started bitcoin on his own.
2. Satoshi is a group of individuals who started bitcoin together but under the same name.
3. Satoshi is a project group in the NSA who started bitcoin with the ambition to test an on-line currency that can be easily monitored
Sorry English is not my native language, but I try to write as correct as I can.
Your English is fine. Better than the update suggestion. I made some edits in bold.