Complex sentence: In Toulon, where he was serving on the "Condorcet", Cousteau carried out his first underwater experiments, thanks to his friend Philippe Tailliez who in 1936 lent him some Fernez underwater goggles, predecessors of modern diving masks.
Split into simpler sentences: In Toulon, where he was serving on the "Condorcet", Cousteau carried out his first underwater experiments, thanks to his friend Philippe Tailliez. In 1936, Tailliez lent him some Fernez underwater goggles, predecessors of modern diving masks.