Complex sentence: Many experimented with coils of wire, but without success, finally Mihajlo Pupin succeeded, but as he said, it worked because he did not rely on luck; he instead had in mind the mathematical solution of La Granges problem.
Split into simpler sentences: Many experimented with coils of wire, but without success. Finally, Mihajlo Pupin succeeded but as he said, it worked because he did not rely on luck; he instead had in mind the mathematical solution of La Granges problem.