Complex sentence: He was capable of making small movements that were not initially detected by his primary caregivers until one of his day carers, an aromatherapist named Virna van der Walt, began noticing that Pistorius would react to specific statements and questions she made.
Split into simpler sentences: He was capable of making small movements that were not initially detected by his primary caregivers. One day, Virna van der Walt--an aromatherapist one of Pisorius's day carers--began noticing that Pistorius would react to specific statements and questions she made.