Complex sentence: Emil Racoviţă continued his research, contributing to speleology and exploring over 1,400 caves in France, Spain, Algeria, Italy and Slovenia; he is considered to be, together with René Jeannel, one of the founders of "biospeleology".
Split into simpler sentences: Emil Racoviţă continued his research, contributing to speleology and exploring over 1,400 caves in France, Spain, Algeria, Italy, and Slovenia. He is considered to be, together with René Jeannel, one of the founders of "biospeleology".