Complex sentence: The young Samuel Colt, struggling to establish a firm to manufacture his new revolver, was aided by Ellsworth, who in 1836 made the decision to issue Colt U. S. Patent No.138.
Split into simpler sentences: The young Samuel Colt was struggling to establish a firm to manufacture his new revolver. Ellsworth became interested in Colt's invention, and in 1836 made the decision to issue Colt U. S. Patent No.138.