Complex sentence: They often serve as greeters when foreigners and dignitaries visit the city, and are required to be knowledgeable about the city landmarks and history also they need to have a good GPA to be accpeted and also need to have great interview skills.
Split into simpler sentences: They often serve as greeters when foreigners and dignitaries visit the city, and are required to be knowledgeable about the city landmarks and history. In addition, they need to have a good GPA to be accepted and have great interview skills.