Complex sentence: However, these antibodies are also present in approximately 1--2.5% of fertile men and in 4% of fertile women; the presence of ASA in the fertile population suggests that not all ASA cause infertility.
Split into simpler sentences: However, these antibodies are also present in approximately 1--2.5% of fertile men and in 4% of fertile women. The presence of ASA in the fertile population suggests that not all ASA cause infertility.