"..having covered their respective Buddha-
lands with their tongue, their make penetration:"

     This continues Section 11 which lists the
Buddhas of the Eastern direction, who are the
subject of the gerund samcchadyitva "having
covered"--prefix sam- + root û chad- "cover over"
with gerund suffix -tva  attached with the linking
vowel -i- to the causative stem: chadaya-.
What they cover is svakasvakani "their respective"
buddhaksetrani  "Buddhalands " --accusative
plural neuter, direct object of the gerund,
They do so jihvendriyena "with their tongue"--
instrumental singular of the compound jihva
"tongue" and indriya "organ."

    The finite verb of which the Buddhas are
the grammatical subject is kurvanti "they make"
from root û kr-  third person plural, present
indicative active. The direct object of that
verb is nirvedhanam "prenetration" (related to
nirvyadh- "pierce through''), a Buddhist liybird
Sanskrit word here accusative singular. What
the Buddhas say and make, penetrate will follow.