Translation of function in Spanish

One hour later people were starting to leave and we did not exactly understand why. We took another drink and I paid the bar man cash. Later it turned out that the change he gave me would be fake money.
I am learning Spanish in university but I also have to improve it for private reasons. Do you have any suggestions. It is giving me a hard time lately as it is difficult. I need to be very patient.
On the other side of the mountain range were the lake region and Bariloche. Argentina had a completely different atmosphere. People were not as calm as in Chile, and it reminded me of Italy.