Complex sentence: Soon after, he entered John Radcliffe Hospital in Oxford complaining of chest pains and died days later on March 10,1988, as a result of myocarditis, an inflammation of the heart muscle caused by a recent viral infection.
Split into simpler sentences: Soon after, he entered John Radcliffe Hospital in Oxford complaining of chest pains. Gibb died on March 10,1988, as a result of myocarditis, an inflammation of the heart muscle caused by a recent viral infection.