What is....... Expression “一…就…” - what if there is a sub-sentence?

Example: 我回家以后就预习功课。

回答： 我一回家就预习功课。

This structure is quite easy. However, how would we apply the same “一...就...” structure if there is an extra 'sub-sentence' in the example (i.e. 这一课很容易).

What would be a grammatically correct answer then, to make it into a smooth whole?

Example: 这一课很容易，我看了一会儿就懂了。

回答： ...❓

Would 我一看这很容易的课就懂了。 be correct?

Would 我一看了这很容易的课就懂了。 be more correct?