Complex sentence: However, Garo's armor has mysteriously been tarnished black, leaving many questions behind the loss of his golden armor's radiance and the fate of Ryuga's predecessor Kouga Saezima.
Split into simpler sentences: However, Garo's armor has mysteriously been tarnished black. Leaving many questions behind the loss of his golden armor's radiance, and the fate of his predecessor, Kouga Saezima.