How about this? "Using the methods presented here, written responses of second and foreign language learners can be analyzed and graded objectively, and language development can be measured reliably."

There you go: The result of this study could be applicable to objectively analyzing and grading the written text of learners. It could also be a reliable indicator of a learner's language developments for Second or Foreign Language researchers.

The results of this study could be applicable to the making of objective analyses and grading of written texts of students, and it could also be a reliable aid to help second or foreign language teachers to monitor the progress of their students. Not > If you are in an institution to learn , you are a student, not a learner. We all study in order to learn. > I did not learn anything until I became a student. > Infinite "to" + base verb or gerund as a noun, not gerund as a continuous form of a verb. >To indicate is just to point out . To monitor is to check the progress or quality over a period of time so you can review them at any time.