Complex sentence: Next, the enzyme glucuronate reductase concerts D-glucuronate to L-gluonate, and then the enzyme gluonolactonase converts L-gluonate to L-gluonolactone.
Split into simpler sentences: Next, the enzyme glucuronate reductase concerts D-glucuronate to L-gluonate. Then the enzyme gluonolactonase converts L-gluonate to L-gluonolactone.