Complex sentence: Bruce created the Bat Armor years earlier in light of his increasing heart problems as a possible replacement for the Batsuit; however, during testing, using the armor nearly gave him a heart attack and he was forced to abandon that option.
Split into simpler sentences: Bruce created the Bat Armor years earlier in light of his increasing heart problems, as a possible replacement for the Batsuit. However, during testing, using the armor nearly gave him a heart attack and he was forced to abandon that option.