Complex sentence: Jockey Club de Rosario is a sports club based in Rosario, Argentina; its rugby union team is member of the Unión de Rugby de Rosario and also one of the most successful teams in Rosario, along with Atlético del Rosario and Duendes.
Split into simpler sentences: Jockey Club de Rosario is a rugby union team based in Rosario, Argentina, part of the Jockey Club de Rosario sports club. The tem is member of the Unión de Rugby de Rosario and also one of the most successful teams in Rosario, along with Atlético del Rosario and Duendes.