Would you tell me what is the meaning of this sentence? Thank you!
A statement will also be required if you have been registered with the NZ Teachers Council before and have not taught since the last application.

I cannot understand this sentence. Would you tell me the meaning of it, especially "before and have not taught since the last application."
In addition, I have got another questions about this sentence.
"if you have been registered with" why it uses present perfect here?

Thank you so much!

Question

Would you tell me what is the meaning of this sentence? Thank you!
A statement will also be required if you have been registered with the NZ Teachers Council before and have not taught since the last application.

I cannot understand this sentence. Would you tell me the meaning of it, especially "before and have not taught since the last application."
In addition,  I have got another questions about this sentence.
"if you have been registered with"  why it uses present perfect here?

Thank you so much!

Answer

It means that if you submitted your registration documents sometimes before and from that moment till now you haven't thought any one yet, you need to write letter or ask for a kind of permission again. 
Because the excat time sequence is not known.