Complex sentence: He first became involved with the organization in 2014 while still attending Louisville; after returning from his brief professional career in Greece, he started organizing basketball camps for children on the autism spectrum, which he has continued to do ever since.
Split into simpler sentences: He first became involved with the organization in 2014 while still attending Louisville. After returning from his brief professional career in Greece, he started organizing basketball camps for children on the autism spectrum, which he has continued to do ever since.