I need to fix this sentence:

After the settlers came our countrys landscape changed mountains wer bare and many streams went dry

Please help I'm not good w/ punctuation

You have two separate sentences here. They should either have a period or a semi-colon between them.

What do you think these two sentences are?

The other punctuation error is with country ' s

thanks:>

Is

After the settlers came, our country's landscape changed. Mountains were bare and many streams went dry.

Correct?
I'm not sure of the comma after came
Thanks

Right! :-)

Congratulations on also picking up on the comma after came. It's needed to set off the introductory adverbial clause.