Complex sentence: When Tsubasa was unable to fight as Tiga against Jomonoid, Tsubasa senses the synchronization between the headdress he wore and the bronze Spark Lence, which prompted him to transform into Tiga, successfully bringing out his full power and put an end to Dogramagma's tyranny.
Split into simpler sentences: When Tsubasa was unable to fight as Tiga against Jomonoid, Tsubasa senses the link between himself and Tiga. He took up the bronze Spark Lens, which prompted him to transform into Tiga, successfully bringing out his full power and put an end to Dogramagma's tyranny.