Original sentence: It is entirely focused on the sea – geography, ecology and fishing, - transportation and yachting.It is one of the oldest French TV series still running (together with Des chiffres et des lettres).It started on September 27, 1975 and now after 38 years it is still one of the most prominent TV programs in France.Thalassa is a French documentary shown every Friday  at  9:00pm on France 3
Edited sentence: It startet on 27.9.1975 and now after 38 years it is still one of the most prominent and popular tv-series in France.Its one of the oldest French TV-Series still to see on TV (together with Des chiffres et des lettres).Thalassa is a french movie documentary serie shown every Friday  at  21h on France 3.The serie is entirly focused on the sea – geography & ecology, fishing and fishering, - transportation and yachting