Personnal homework (Announcement of company name change)

Good afternoon Ms. [Name] [이름]^^

Here\'s the correction for your personal homework.

We are pleased to inform you that our company’s name is changed by B as of 2020. JAN. 2nd for a new leap forward.
>>We are pleased to inform you that our company\'s name has been changed to B as of 2020 Jan 2nd for a new leap.
We’ve been in the library music business for the last 30 years and have carved out as the first music publishing company in Korea.
>>CORRECT!
After the first introduction of the music copyrights business in Korea, our company have achieved quantitative and qualitative development with the continual expanding global network and the system development.
>>Since the first introduction of the music copyright business in Korea, our company has steadily expanded its global network and achieved quantitative and qualitative development through system development.
As we celebrate our 20th anniversary in the name of A, we are the largest and best music library company in Korea, working together with more than 100 leading partners around the world, and now we are planning to make a bigger leap forward with new name B.
>>CORRECT!
B will challenge the larger market with a content diffusion strategy that can respond to the rapidly changing domestic and overseas market conditions.
>>CORRECT!
We will show you at the heart of the content platform that associated with music, always trying and growing.
>>CORRECT!