Scientists effort to invent a device which enable human to breathe under the water for a long time

Listening Summary : Artificial Gills - enabling human to breathe in the water

We all know that all living creature needs oxygen. When it comes to human, they could not breathe under the water, and sometimes drown in the water. For that reason, several scientists is in an effort to invent a device which enable human to breathe under the water for a long time. The former breathing apparatus, called scuba, is painful and heavy. So that, they need a device that can extract oxygen directly from water while swimming, and comfortable to use. The artificial gills, is the solution for this problem. To create an artificial gill, we need to find fragile material with big surface area, and we also need tiny tubes and valves to enabling divers to breathe. The imperative step is that we should keep the water move. The speaker, had created her own artificial gills and tried it in the swimming pool, and she can breathe for 45 minutes. In the future, the speaker believe that the device has a great potential in marine area.

source : Cambridge

Dear Nda
Here, my corrections toward your writing

For that reason, several scientists is in an effort to invent ...
>>> several scientists carried out the ambitious project to invent a technology device which enables a human to air in and out of lungs although in the sea.

note: you wrote every single sentence perfectly, you used word connector properly while you used varied vocabulary. Furthermore, although you provide the brief explanation, it provide us with an array of information. However, you have to notice to your writing whether your sentence already provided and showed enough information before you are going to explain other topic