Translation of drink in Spanish

I hope you can understand the corrections this way... Two small errors. let me know if there is a word or sentence or phrase that you didn't understand! I will try to think more on the "since" question...
We arrived at the hotel which we booked in advance but decided not to stay there. Instead the driver convinced us to stay at the Borei Angkor Hotel. We were sure that he would get a sales commission.
Spain seems do be doing much better since the 1970. It is completely democratic now. At work I have a lot of meetings with International companies and therefore I want to know many languages.