We apologize as, due to our company's staff transfer, we have been unable to visit you. We have generated a new schedule to visit with our members. We would like to know if you are still able and willing to accommodate our request. Please let us know your availability and send us a letter of invitation when you are able to speak with us. I am assuming this is for a business, so I reworded it more professionally, although it is difficult because I don't know exactly what the business is about. There were a few common mistakes such as starting a sentence with because. Also, it is much more professional when you do not use conjugations in formal writing, even in an e-mail to a coworker. Hope this helps!

Because of the staff transfer of our company, we're so sorry that we haven't visited you for so long. So we already planned a new schedule for our visit, including the members. We want to know whether you will still welcome us to talk about the machinery and if you will still send us the invitation letter.