Here are examples of the word/phrase "subpar" used in a sentence and paraphrased in a sentence...
It is shocking how that team managed to win the championship with a subpar performance.
It is shocking how that team managed to win the championship with a below average performance.
Bruce's ability to strategize compensates for his subpar offensive power.
Bruce's ability to strategize compensates for his below average offensive power.
The judges gave him a 4 because his performance was subpar.
The judges gave him a 4 because his performance was less than mediocre.
Other Examples...