Answer:
False
Explanation:
The sentence provided is made up of one dependent clause (also an adverb clause): Although playing tennis is his passion and one independent clause he also enjoys other sports. The grammar rule is that whenever an adverb clause begins a sentence, it should be followed by a comma to separate its information with the independent's clause information. Therefore, to correct the sentence, you must put a comma at the end of the dependent clause:
Although playing tennis is his passion, he also enjoys other sports.
