Usually you would add and, or you could add a coma. But make sure you have no words that make no sense
<span>Each scientists have there own opinion. Some accept theories and some have to have facts.</span>
While this should be something you should answer on your own with your own feelings, an example paragraph could be this:
Example: When I first learn to research things, I had difficulty citing and finding legitimate resources. Now, I've figured out how by asking for help and by using the skills I've been taught in the past. I've developed an understanding of how to reasearch by the lessons I've also been taught now. I've now developed the skills to see if an article or video is legitimate. I can now say I was happy to learn how to reasearch things properly, because it will benifit me in the future.
Hope that helps.
