Complex sentence: He is a co-author of seventeen books and more than four hundred research publications and has served/serving as editor in most of the well-known scientific journal in computer science and engineering (~ 20 international journals).
Split into simpler sentences: He is a co-author of seventeen books and more than four hundred research publications. He has served/serving as editor in most of the well-known scientific journal in computer science and engineering (~ 20 international journals).