Complex sentence: He was a soldier, but his saintly devotion and martyrdom, led to veneration and devotion by his "profession"-a soldier saint; soldier first but who who became a Saint by martyrdom to Jesus Christ.
Split into simpler sentences: He was a soldier, but his saintly devotion and martyrdom, led to veneration and devotion by virtue of his "profession"-a soldier saint. A soldier first but one who became a Saint by martyrdom to Jesus Christ.