Simplify the following text for a Grade 7 native English-speaking person.
Original: The trains have been built with Bombardier 's FICAS technology , giving a thinner bodyshell and hence ( along with the larger size ) more internal space for passengers .
Simplified: The trains have been built using Bombardier 's technology called FICAS , which gives them a thinner bodyshell . Along with the larger size this gives more space for passengers .