Complex sentence: They are speclized metaprogramming tools employing syntax driven translation that take as input programs, written in specialized metasyntax defined metalanguages (whence the prefix "meta"), and translates that program to an equivalent executable set of instructions.
Split into simpler sentences: They are speclized metaprogramming tools employing syntax driven translation that take as input programs, written in specialized metasyntax defined metalanguages (whence the prefix "meta"). Me and translates that program to an equivalent executable set of instructions.