Complex sentence: Other tasks, such as gestural imitation and causality tasks, were performed more weakly by the children with disabilities but object permanence was still acquired in a similar fashion because they were not related to social interaction.
Split into simpler sentences: Other tasks, such as gestural imitation and causality tasks, were performed more weakly by the children with disabilities. However, object permanence was still acquired in a similar fashion because they were not related to social interaction.