Complex sentence: The semen exuded by the male congeals into a large spongy mass called a "spermatozeugma", in which the individual spermatozoa are embedded, inside the female's uterus; the function of this short-lived structure is unknown.
Split into simpler sentences: The semen exuded by the male congeals into a large spongy mass inside the female's uterus, in which the individual spermatozoa are embedded. Called a "spermatozeugma", the function of this short-lived structure is unknown.