Looks like an extract from a resumé :D
1. Explaining menu items clearly and giving suitable recommendations to people from different countries according to their preferences.
2. Taking detailed and organized customer orders and liaising with the kitchen staff to get them processed
These look short enough and the words used are important. I don't recommend changing them if they are supposed to be in a CV.
However, If you really want to shorten them to just give the general idea,
"Explaining menu items and giving suitable recommendations according to the customer preferences"
"Taking customer orders and liaising with Kitchen staff to get them processed"