Complex sentence: Due to struggles with NCAA eligibility, resulting from Proposition 48 which requires minimum academic standards, he had to redshirt for his freshman a welder during the summers while at Purdue.
Split into simpler sentences: Due to struggles with NCAA eligibility, resulting from Proposition 48 which requires minimum academic standards, he had to redshirt for his freshman season. He worked as a welder during the summers while at Purdue.