Complex sentence: In 1910 he became manager of the radical newspaper "Irish Freedom," which he founded along with Bulmer Hobson and Dennis McCullough, he also became a national organizer for the IRB, and was taken under the wing of veteran Fenian Tom Clarke.
Split into simpler sentences: In 1910 he became manager of the radical newspaper "Irish Freedom," which he founded along with Bulmer Hobson and Dennis McCullough. He also became a national organizer for the IRB, and was taken under the wing of veteran Fenian Tom Clarke.