Complex sentence: Healthy foals pass meconium, the first stool, soon after birth, though some healthy foals may require an enema to assist this process, but the meconium of LWS foals is impacted high in the intestine, and never appears, even with the use of enemas.
Split into simpler sentences: Healthy foals pass meconium, the first stool, soon after birth, though some healthy foals may require an enema to assist this process. But the meconium of LWS foals is impacted high in the intestine, and never appears, even with the use of enemas.