Can you help me correct please?

In addition to my motivation and my sense of responsibility, my time spent in England allowed me to reinforce the English skills already acquired during my bachelor's degree, so that I am confident that I have the capacities required to successfully complete the master's degree in international project management. Besides I am convinced that the latter will allow me to develop useful and essential skills in the field of business English as well as in the field of economics, to subsequently be able to lead and manage projects internationally.

This isn’t bad. You could use it as it is, but could be improved to be more clear and concise. *Capacities should be capacity*. Some sentences are too long/complex and the use of latter is unclear. I think you mean the masters degree, but I’m not sure. Here’s my suggestion:


In addition to my motivation and sense of responsibility, my time spent in England allowed me to reinforce the English skills already acquired during my bachelor's degree. I am confident that I have the capacity required to successfully complete the master's degree in international project management. I am convinced that the master’s degree will allow me to develop useful and essential skills in the fields of business English and economics, that will subsequently enable me to lead and manage projects internationally.