I HAVE worked with various coworkers, WHO HAVE SPOKEN VARIOUS LANGUAGES, including English, Japanese, and DUTCH during WHICH TIME I WAS COMPLETING MY DOCTORATE DEGREE IN _____. These experiences improve not only my communication IN ENGLISH, BUT ALSO GAVE ME THE ABILITY TO COLLABERATE AND NEGOTIATE with diverse people. Even though I am not a native English speaker, I have strived to learn the language and I am dedicated to becoming a fluent speaker of English.

If I am fortunate enough to be selected for THE position with Nomura, I can promise and I‘m confident that I will competently fulfil any work-related duties that I am assigned.

Thank you for your consideration. I eagerly await your response.

NOTES:
CAPITALS = CORRECTIONS
- You should put down the PhD you earned – what was the degree called?
- “communication and collaboration abilities with diverse people but also my English skills.” = I decided to re-arrange this sentence to make it sound more professional and natural.

Good luck and I hope this helps you, if you have any other questions, feel free to ask.