I think that one way to combine the sentences is to simply reorder the words in the sentence. This would express the two realities in one new sentence. The new sentence could look like this:
Sachin Tendulkar is a popular cricketer who is also great.
In this sentence, the combining sentence is one in which the base of the first sentence is used as well as the use of "also" to combine both. This can be flipped in the other way, as well.
Sachin Tendulkar is a great cricketer who is popular.
This is a variation of the first sentence. In both, the manner of combining the sentences does not use a conjunction to combine them. In both sentences, the sentences combine simply be reordering the words and using one of the adjectives to lead off the sentence. Optionally, you can join them through punctuation by using a semicolon:
Sachin Tendulkar is a great cricketer; he is also popular.