Thank you all for your help.
Could I say" Thanks a lot and please forward my best wishs to (sb)". Do I need a commar here or just make it be " Thanks a lot and best wishs to (sb)"? Make them symmetric, I mean.

As you know, last time, a sentence in my letter "Thanks a lot and please forward my best wishs to your colleagues" is repaired by my director. His reason is the first part and the second part is not symmetric. And he gave me the "correct" sentence" Thanks a lot and best wishs to your colleagues.

Again, I appreciate your response.
Hi Liu, welcome to the forums, I would suggest these two as accurate:

"Thanks a lot and please forward my best wishes to (sb)"

"Thanks a lot and best wishes to your colleagues. "