Complex sentence: The music video was banned from MTV because it showed people jumping in front of trains to kill themselves, though it is also thought that the real reason it was banned may have been to make sure it "didn't give people ideas" about overwork.
Split into simpler sentences: The music video was banned from MTV because it showed people jumping in front of trains to kill themselves. Some would argue that the real reason it was banned, was to make sure it "didn't give people ideas" about overwork.