Complex sentence: By 19 March, his heart was beating without medication and he was able to move his limbs, and later that day his condition was described as "serious" rather than "critical" and he was able to recognise family members and respond appropriately to questions.
Split into simpler sentences: By 19 March, his heart was beating without medication and he was able to move his limbs. Later that day his condition was described as "serious" rather than "critical" and he was able to recognise family members and respond appropriately to questions.