This means: “Sales of Taylor Electronics have increased substantially over the past year, which was a result that some analyst attributed to the CEO’s strong leadership”. Omission of "which was" in such sentences is common usage. And note Nanren888's comment about "analysts" instead of "analyst".

some analysts attributed the fact that Sales of Taylor Electronics have increased substantially over the past year, to the CEO’s strong leadership” “Sales of Taylor Electronics have increased substantially over the past year, <is a result> a result that some analyst attributed to (analysts, surely?) the CEO’s strong leadership”. The question was answered, a result some atrbuted to the asking of the question. The meal arrived; a result some atributed to ordering of the pizza. The cat ran off; a result some attributed to someone standing on her tail.

analysts believe that the ceo's strong leadership caused the increase in sales