、。
Whatever the organization, internal harmony and unity are crucial factors determining its success or failure.
Literal
What-kind-of organization be-[although-であれ], internal [genitive-の] harmony [and-と] unity [topic-は] that organization [genitive-の] success-failure [object-を] decide important factor is.
An analytical/aphoristic sentence. ~であれ ('be it X,' 'whatever X is,' 'no matter what X') is a classical/formal concessive construction, built on the imperative/volitional of である ('be'). Modern equivalents are ~であっても or ~にしても, but であれ is more compact and literary. 成敗 (せいばい) is a Sino-Japanese compound for 'success and failure' — a pair-compound that functions as a single abstract noun. 要素 ('factor, element') is common in analytical writing. The sentence has the rhythm of editorial wisdom literature — compact, parallel, weighty.