QUES: People who are struggling with weight issues know that Garcinia Cambogia is a rare fruit from the Eastern Hemisphere that helps greatly in fat loss

correct the punctuation.

CORRECTED: People who are struggling with weight issues know that Garcinia Cambogia is a rare fruit, from the Eastern Hemisphere, that helps greatly in fat loss.

QUES: Book Writer is a writing environment for creative writers teachers and students

correct the punctuation.

CORRECTED: Book Writer is a writing environment for creative writers, teachers, and students.

QUES: Not only did he lecture in London where he supervised doctoral students but he also began publishing high quality research papers on mathematical analysis

correct the punctuation.

CORRECTED:
Not only did he lecture in London, where he supervised doctoral students, but he also began publishing high quality research papers on mathematical analysis.