Complex sentence: Under Archbishop Purcell, who emphasized the "prudential motives" that made the abolition of slavery inadvisable, the "Telegraph" stridently opposed slavery, secession, and initially abolition, drawing criticism from other Catholic newspapers, particularly the "New York Freeman's Journal".
Split into simpler sentences: Under Archbishop Purcell, who emphasized the "prudential motives" that made the abolition of slavery inadvisable, the "Telegraph" stridently opposed slavery, secession, and initially abolition. Its antislavery stance stood in stark contrast to other Catholic newspapers, particularly the "New York Freeman's Journal".