Complex sentence: In 1888 Erckmann was diagnosed with diabetes, and the year after, his visa expired; no longer allowed to reside in his home town, he moved to Lunéville where he stayed until his death in 1899.
Split into simpler sentences: In 1888 Erckmann was diagnosed with diabetes, and the year after, his visa expired. No longer allowed to reside in his home town, he moved to Lunéville where he stayed until his death in 1899.