Is this sentence ok in the context

[samjames]

Good morning!

Please could I ask if the following underlined sentence is correct in this context? I thought it was as it is a natural transition. I was told I should use fanboys?

Thanks very much.


TESOL is an internationally recognized qualification which allows people to teach English in many countries across the world. Therefore, this course is not to be taken lightly, it requires a lot of focus and dedication to learning

[Alan]

Actually it is not correct, but should be rewritten as two sentences:

--> Therefore, this course is not to be taken lightly. It requires a lot of focus and dedication to learning.