Complex sentence: For example, a blood group B individual who has received a transfusion of group O donor red cells may show mixed field agglutination with anti-B sera whereby his own group B red cells are agglutinated, while the group O donor red cells in his circulation are unagglutinated.
Split into simpler sentences: For example, a blood group B individual who has received a transfusion of group O donor red cells may show mixed field agglutination with anti-B sera. His own group B red cells are agglutinated by the anti-B sera while the group O donor red cells in his circulation are unagglutinated.