Some thoughts: First, there are some grammar problems to sort out. A diligent scientist rather than an diligent scientist. Routine rather than routin. Returning home rather than return home. No comma after daughter. Don’t capitalize Goes. A familiar rather than an familiar. I prefer commas setting off “but mysterious”. Her own people rather than here own people.

Just fixing the grammar, your logline becomes:

A diligent scientist on his last routine mission in space before returning home to his beloved daughter goes out of his way to save a familiar, but mysterious, woman from getting killed by her own people.

Now onto the conceptual issues. Knowing the scientist is diligent doesn’t really inform either going home to his daughter or saving this woman. I’d cut the adjective or replace it with something more relevant. Last mission is fine without routine (routine doesn’t add much). “goes out of his way” again doesn’t add much. I’d hope most film protagonists go out of their way to accomplish the goal of the film. Otherwise, what’s the point? We also need to know more about this mysterious woman. Why is she in danger? Is she alien? Otherwise, aren’t her own people also his own people?

Taking a best stab with the information we have:

A scientist on his last space mission before returning home to his family gets drawn into a deadly conflict when he saves a mysterious woman from getting killed by the other people in her space colony.

Totally guessing on some of that, but hopefully it gives you an idea of what information I find important, and what type of information needs to be added to flesh out the concept in the logline.

Good luck!