Dear Teacher. Please check if the sentences are correct
1) Mr. Martin A. Anderson who is applying for the position of manger of manufacturing support at your organization requested that I write this confidential letter of recommendation.

2)
As a supervisor of manufacturing support Mr. Anderson helped to hire, evaluate, and supervise a team of four machine technicians.

3)
Although documentation changes were cumbersome for our engineers, Mr. Anderson brang about needed change without alienating engineers or technicians.