[Grammar] The Superconcert which is performed

[bhb113]

The Superconcert which is performed by popular foreign artists is not only the most important marketing task in Hyundai Card but also the most popular cultural event in Korea. Hyundai card can make this event successful through a ceaseless effort of cultural marketers. Of course, they have fluency in English but most important part is the ability of how they can keep up with the trend in that country and how they can understand the culture and think. As for me who want to be a cultural marketer, the way how language is used for a media between culture and culture is very interesting. So it is absolutely essential for me to study in the department of English language and literature where I can improve my English ability and learn English culture

Is there any grammar error or awkward sentence?

 

[teechar]

The Superconcert which is performed by popular foreign artists is not only the most important marketing task in Hyundai Card but also the most popular cultural event in Korea. Hyundai card can make this event successful through a ceaseless effort of cultural marketers. Of course, they have fluency in English but most important part is the ability of how they can keep up with the trend in that country and how they can understand the culture and think. As for me who want to be a cultural marketer, the way how language is used for a media between culture and culture is very interesting. So it is absolutely essential for me to study in the department of English language and literature where I can improve my English ability and learn English culture

I don't understand the parts in blue.