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No problem in the following two sentences?
1. There is no change in the management and the
type of business we have been engaged in.
2. A great deal of that success, we are certain,
has been achieved under your strong leadership
and fine personality.
Thank you.
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1. There is no change in the management or the
type of business in which we are engaged.

2. A great deal of that success, we are certain,
has been achieved under your strong leadership
and charismatic* personality.

*There are many words that could be substituted here depending on the exact meaning you wish to convey, however I agree that 'fine' would not normally be used.

Others could include impressionable, agreeable, approachable.

You could also simply say 'A great deal of that success, we are certain,
has been achieved under your strong leadership and personality'.
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Dear HR Department,

Thank you for your email about my report today.

Best regards,

Sean Lu (陆雪游)
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Comments  
I don't see anything wrong with your sentences, but would suggest that you change fine by something else
 rwiles's reply was promoted to an answer.
Dear HR Department,

Thank you for your email about my report day.And my name is Sean Lu(陆雪游).

Best Regads,
Teachers: We supply a list of EFL job vacancies
 Mister Micawber's reply was promoted to an answer.
i hope if some one can send me information about sites to help me in writing sponsor ship letters

thks

Ashraf