Is this a correct English sentence?
Although, I'm not very clear about the reason, but that's where the problem lies.
Can 'although' and 'but' be used together in one sentence?
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Although and But, both can be used to introduce a statement that make your main sentence surprising
It's an old car, but it's very reliable
Although it is an old car, it's very reliable.
But in your sentence, you used both of them together, as
Although it is an old car, but it's very reliable.
It could be grammatical in some languages (for example in Persian) and maybe make more emphasis but actually you don't need both of them.
Since 'although' as a subordinating conjunction implies or introduces a contrast idea and 'but'as a coordinating conjunction contrasts an idea, ideally both may go against the understanding that they negate each idea. Therefore, they both may be ineffective when used together. In addition, as what was mentioned in the first comments,'although' which introduces a subordinate clause as in "Although, I am not very clear about the reason" will need an independent clause. 'But', on the other hand, should join the independent clause " that's where the problem lies" with another independent clause; thus, making the latter not the independent clause of the former.
You should not.
One very common error with the usage of the conjunctions although and but is illustrated below:
Although these products are expensive, retailers have no problem selling them.
These products are expensive but retailers have no problem selling them.
Although these products are expensive, yet retailers have no problem selling them.
Source of above examples, is here: http://www.cdtl.nus.edu.sg/wrg/conjunction.htm
Although I am not very clear about the reason, but that's where the problem lies.
When you use although as a subordinate conjunction to introduce a subordinate clause, there must be a main clause to complete the sentence. So if you use although as a subordinate conjunction in one clause and but as a coordinate conjunction in the other clause, the sentence will be incorrect grammatically.
Besides, the placement of the although in the sentence doesn't seem correct. I would rephrase the sentence as follows:
I am not very clear about the reason, but that's where the problem lies.
Alternatively, you can use although instead of but because although is also used in the sense of but.
I am not very clear about the reason, although that's where the problem lies.
As far as i know,'Although' simply has same meaning of 'but'. It is quite odd to use together in one sentence. For example, althoughshe is very beautiful but selfish. Instead of this, it is better to leave out one of them to have a clear meaning. 'she is very beautiful but selfish'. Hope this helpful.!!!