en_tn_lite_do_not_use/mrk/04/33.md

he spoke the word to them

"Word" here is a synecdoche for "the message of God." The word "them" refers to the crowds. Alternate translation: "he taught the message of God to them" (See: rc://en/ta/man/translate/figs-synecdoche)

as much as they were able to understand

"and if they were able to understand some, he kept telling them more"