Complex sentence: Initially, the expectation was for Saunders to be on the disabled list until the All-Star break, however after having surgery to remove 60% of his meniscus the estimate was reduced to 4--6 weeks.
Split into simpler sentences: Initially, the expectation was for Saunders to be on the disabled list until the All-Star break. However, after having surgery to remove 60% of his meniscus, the estimate was reduced to 4--6 weeks.