Complex sentence: Shadow the Hedgehog was shown by Takashi Iizuka for "Sonic Adventure 2", he was first shown to the public in a game trailer, but his name was not revealed.
Split into simpler sentences: Shadow the Hedgehog was conceived by Takashi Iizuka and first appeared in "Sonic Adventure 2". The character was first shown to the public in a game trailer; however, his name was not revealed.