Complex sentence: Etel competed in the women's duet at the 2012 Summer Olympics with her twin sister Sofía and finished in 22nd place and at the 2016 Summer Olympics where she finished in 19th place.
Split into simpler sentences: Etel competed in the women's duet at the 2012 Summer Olympics with her twin sister Sofía and finished in 22nd place. She also competed at the 2016 Summer Olympics with her sister and finished at the 19th place.