Correction of three sentences, thanks.

[heyuting]

Once a correspondent asked Steve Jobs to give him advice on how to create excellent products, the answer is focus. Actually this concept has influenced a large number of companies. For example, in the Chinese cellphone market, increasingly, many corporations begin to focus on producing one excellent product every year, however, two years ago, these companies produced 5 different kinds of cellphones per month.

Thank you.

[JohnParis]

Hello Heyuting,
Here is my suggestion. I split your first sentence into two because you are writing reported speech. There are other ways to rephrase the rest of the paragraph, but I decided to remain as faithful to your original words as possible. I hope other contributors will jump in and offer their suggestions.

Once, a correspondent asked Steve Jobs to give him advice on how to create excellent products. His answer was "to focus." This concept has influenced a large number of companies. For example, in the Chinese cellphone market, many corporations have begun to focus on producing one excellent product every year. Two years ago, these companies produced 5 different kinds of cellphones a month.

[heyuting]

Thank you. It's very kind of you!

Hello Heyuting,
Here is my suggestion. I split your first sentence into two because you are writing reported speech. There are other ways to rephrase the rest of the paragraph, but I decided to remain as faithful to your original words as possible. I hope other contributors will jump in and offer their suggestions.

Once, a correspondent asked Steve Jobs to give him advice on how to create excellent products. His answer was "to focus." This concept has influenced a large number of companies. For example, in the Chinese cellphone market, many corporations have begun to focus on producing one excellent product every year. Two years ago, these companies produced 5 different kinds of cellphones a month.