ἐφ' ὅσον αὐτοῦ ἡ ὑπόστασις τῶν χρόνων ὑπῆρχεν → as long as his store of years lasted
v. ὅστις.
ὁστισδηποτοῦν: тж. раздельно Dem., Aesch. = ὁστισοῦν.
(see also: ὅστις) some one or other, someone or other