The artist recited the poem "Six Hundred".

актриса - feminine singular

поэма- feminine singular

шестерка сотня - plurall feminine

artist -subject
poem- indirect object
"Six Hundred"- direct object

artist - subject = nominative case
poem - indirect object - dative case
"Six Hundred" - direct object - accusative case

Актриса рассказывала поэма шестерка сотня.^ accusative feminine plural

^nominative ^ ^dative
feminine/singular
feminine
singular