The phrase "although it became apparent" is correct and usable in written English.
It can be used to introduce a contrast or a realization that has emerged over time in a discussion or narrative.
Example: "Although it became apparent that the project was behind schedule, the team remained optimistic about meeting the final deadline."
Alternatives: "even though it was clear" or "despite it becoming obvious".
But the philosophy on the film was that we are making a movie, and we never did talk about No. 2, although at the end it became apparent that the phenomenon of the "Harry Potter" books was growing, and it was acknowledged that there would be another one.
Although it was initially underestimated, it became apparent that CC may be responsible for up to 5% of the cases investigated for chronic, watery diarrhea [ 2].
They were supposed to have been in place by 1 April to replace NHS Direct, although ministers relaxed this deadline after it became apparent some areas were not ready.
Furthermore, it became apparent that although MAPK inhibition increased NANOG and ZIC3 expression, this is insufficient to maintain pluripotency.
During these investigations, it became apparent that, although drugs such as PTX are hydrophobic, a pronounced hydrophobicity of the hydrophobic block is not necessarily beneficial for drug solubilization.
Although not specifically identified by participants, it became apparent as interviews progressed, that the needs of some individuals to speak one on one with another person had not been met by the family meeting.
From conversations with community leaders, visits to educational establishments (2 primary schools, 2 secondary schools and the regional college) and health facilities (drugstores, 3 local health centres and a teaching hospital) it became apparent that although there are detailed national policies to address HIV/AIDS, malaria and population growth, many of these policies are poorly implemented.
One contemporaneous report noted that although DC solicited issue #12 for publication in April 1987, it became apparent "it won't debut until July or August".
Although caspase-dependent apoptosis seems to be a common type of cell death it became apparent that cells could also die when caspase function is blocked.
