Simplify the following text for a Grade 6 native English-speaking person.
Original: Croatian language uses Latin script of 30 letters and one diphtong `` ie '' or `` ije '' , and '' Å '' , such system is in Croatian called gajica ( or croatian Gaj 's Latin alphabet ) , name came from Ljudevit Gaj .
Simplified: Croatian is written in Gaj 's Latin alphabet .