Complex sentence: Because INS had been a subsidiary of Hearst's King Features Syndicate and Scripps controlled several other newspaper syndicates, due to possible anti-trust issues, the two companies deliberately kept their respective syndicates out of the combined UPI company.
Split into simpler sentences: Because INS had been a subsidiary of Hearst's King Features Syndicate and Scripps controlled several other newspaper syndicates, both companies feared possible anti-trust issues. So they deliberately kept their respective syndicates out of the combined UPI company.