I have worked in several research teams during my mMaster's and understand the importance of group projects. I have worked in several research teams during my Master's and understand the importance of group projects.

That is why I have been attemptworking ton improveing my group and language skills during theseover these past [#] years. That is why I have been working on improving my group and language skills over these past [#] years.

*attempting to improve This is technically correct. I suggest "working on" because "attempt" implies trying without success, while the phrase "working on" implies progress towards your goal. *during The phrase "during these" implies a specific number of years, e.g. "During these seven years." I also suggest using "over these past" as a more natural way of saying the same thing. It also allows you to be more vague, as in "over these past few years."

During my internship and education at university, I have learned to utilize various types of identification apparatusresearch tools, such as spectroscopic instruments, and have some experience with computational chemistry experience. During my internship and education at university, I have learned to utilize various types of research tools, such as spectroscopic instruments, and have some experience with computational chemistry.

*at university I assume you're aiming at a British English, I believe. If you're aiming at an American audience, I would use "college" or specify the university, e.g. "Brighton University". *identification apparatus Technically correct, but less natural. Additionally, since you said "various types," I would suggest giving at least one more example.

TheMy CV is attached below the letter. My CV is attached below.

This phrasing is a bit more natural.