Impairment of fertility Men being treated with cladribine are advised not to father a child up to 6 months after treatment and to seek advice of cryoconservation of sperm prior to treatment because of the possibility of infertility due to therapy with cladribine ( see Section 5 . 3 Preclinical safety data ) .
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
Impaired fertility Men taking cladribine are advised not to father a child for 6 months after stopping treatment . Possible cryopreservation of semen before treatment should be considered due to the risk of subfertility associated with treatment with cladribine ( see section 5 . 3 ) .