The phrase "although it was obvious" is correct and usable in written English.
You can use it to introduce a contrast or to acknowledge something that is clear or evident, often in a context where the speaker is about to present a differing opinion or situation.
Example: "Although it was obvious that the project would take longer than expected, the team remained optimistic about the outcome."
Alternatives: "even though it was clear" or "despite being apparent".
Also, although it was obvious right away that this item is a breathtaking technological advance, can you please inform us exactly what it is for?
Although it was obvious to few others at the time that Schubert, still little known outside Vienna or in grand musical forms, was a logical candidate to take up Beethoven's mantle, from this and other evidence it was apparent to Schubert, Mr. Gibbs plausibly suggests, as it has been to posterity.
Leslie Felperin Although it was obvious at the time, it seems strange now that Jackie Chan was originally groomed by at least one Hong Kong producer as a successor to Bruce Lee, the lithe master of martial arts whose style was almost laughably serious in its grim-faced intensity.
Although it was obvious from the outset that there were so few troops that the outpost, like others of its kind, could barely defend its bunkers and patrol at the same time, much less disrupt a growing insurgency, the dispatches carried notes of cheerful confidence when they described the campaign for local hearts and minds.
Although it was obvious that companies are increasingly dealing with the "Internet of Things", the grade of diffusion was mostly comparatively low.
In reality, although it was obvious he had the necessary raw material, I wondered if he knew how to package it to attract an employer.
It has a cod-existentialist pseudo-angst that keeps reminding me of the 1950s British artist Reg Butler, although it is obvious Gormley would rather be thought of as a 21st-century Giacometti.
Although it is obvious that editors would not wish to repeat the sins of the past, they are fascinated by the story and remain wedded, as always, to the kind of scoop journalism that can lead them to overstep the mark.
Most of his barbs are aimed either at Kitty's gay friend Carl Brian Keanee), whose relationship with a much younger lifeguard gets under Miles's skin, or Miles's wife, Bea (Kate Arrington), who has embarked on a home redesign as a therapeutic "joint project" for the couple, although it is obvious that Miles has ceased to see their marriage as one.
Although it is obvious in Fig. 7 that the 2D deterministic shadowing from the MR-FDPF model is correlated, we want to know how much it is correlated.
Although it is obvious that the size effect nearly doubled from 1996 to 2006, such a change should be formally tested.
