During my last summer vacation, I i

During my last summer vacation, I interned at (ชื่อบริษัท), a leading media agency in Thailand where I had
a chance to practise writing advertising copies and learned how to work as professional in the field.

ผลลัพธ์ (อังกฤษ) 1:

during my last summer vacation, i interned at (company name), a leading media agency in thailand where i had
a chance to practise writing advertising copies and learned how to work as professional in the field.
.

ผลลัพธ์ (อังกฤษ) 2:

During my last summer vacation, I interned at (name of company), a leading media agency in Thailand where I had a chance to practise writing powerful advertising and learned how to work copies as professional in the field.
.