Complex sentence: In the beginning the term "Jardin des Plantes" referred only to a botanical garden of 58 acres, created and built by the royal physicians Jean Herouard and Guy de La Rousse.
Split into simpler sentences: In the beginning the term "Jardin des Plantes" only meant a botanical garden with an 58 acres large area. This one was created and built by the royal doctors named Jean Herouard and Guy de La Rousse.