Simplify the following text for a Grade 7 native English-speaking person.
Original: Leathermouth ( often typeset as LeATHERMÃ UTH ) is the post-hardcore side project led by My Chemical Romance 's rhythm guitarist Frank Iero .
Simplified: Leathermouth ( also spelled as LeATHERMÃ UTH ) is an American post-hardcore rock band . The band was started in 2007 by My Chemical Romance 's guitarist Frank Iero .