Complex sentence: Joseph worked in the areas of development, marketing and music and oversaw a nine-member marketing team which marketed Walden/Crusader films like Holes, Because of Winn Dixie, I Am David, Joshua, Children On Their Birthdays and others.
Split into simpler sentences: Joseph worked in the areas of development, marketing and music. He also oversaw a nine-member marketing team which marketed Walden/Crusader films like Holes, Because of Winn Dixie, I Am David, Joshua, Children On Their Birthdays and others.