Complex sentence: Arnold J. Berk is an American professor of microbiology and immunology who is an author and co-author of many peer reviewed articles and was a member of the Molecular Biology Institute, a division of University of California, Los Angeles from where he got his Ph.D. as well.
Split into simpler sentences: Arnold J. Berk is an American professor of microbiology and immunology at the University of California, Los Angeles. He was a member of the Molecular Biology Institute, a division of University of California, Los Angeles from where he got his Ph.D. as well.