As the pronoun "he" in the second sentence is making a reference to the noun "friend" in the first sentence, the adjectives from the second sentence can be integrated in the first sentence to qualify the friend. The following example is a combination of both sentences, and it includes an adjective clause:
"My friend who is tall and strong excels at all sports".
Answer:
The answer is "My friend excels at all sports because he is tall and strong"
