Complex sentence: The "o-yoroi" could take up to 265 days to make, using 2000 "kozane" in its construction, the time, materials and labor meant that an "o-yoroi" was a substantial investment for a samurai.
Split into simpler sentences: The "o-yoroi" could take up to 265 days to make, using 2000 "kozane" in its construction. The time, materials and labor meant that an "o-yoroi" was a substantial investment for a samurai.