Complex sentence: As of November 2011, line 1 has been retrofitted with platform screen doors, in preparation for full driverless automation in 2012; also is being line 13 since 2010 because of its overloading, after the tests in 2006.
Split into simpler sentences: As of November 2011, line 1 has been retrofitted with platform screen doors, in preparation for full driverless automation in 2012. Line 13 also has has platform edge doors since 2010 because of its overloading, after tests in 2006.