Original:

In this essay I will discuss the arguments for using authentic texts in the classroom and the problems created for learners as a result of using them. First, I will discuss the arguments in favour of authentic texts, followed by the reasons underlying each argument. The arguments I will consider include the increase in learner participation, and enhanced learner grammar through self-discovery. Secondly, I will present the problems created for learners. I will suggest that this teaching approach lacks guidance or focus for learners, and that authentic texts provide too much terminology and jargon.

Suggested re-wording to turn from 1st person into 3rd person (please note this is just one way of doing it):

This essay will discuss the arguments for using authentic texts in the classroom and the problems created for learners as a result of using them. First, an overall presentation of the arguments for authentic text, followed by the reasons underlying each argument, will be discussed. Arguments considered will be the increase in learner participation, and enhanced learner grammar through self-discovery. Secondly, the problems created for learners will be presented. This teaching approach will be discussed as lacking guidance or focus for learners, and authentic texts as providing too much terminology and jargon.

You may see that the passive voice has been used to convert some of the sentences. To find out more about active and passive voices, see the Grammar & Punctuation module of this course.