Complex sentence: A week after South Ferry reopened, the MTA closed the BMT Myrtle Avenue Line for ten months to rebuild two of the line's viaducts, the approaches to the line's junction with the BMT Jamaica Line and Fresh Pond Bridge over the Montauk Branch in Queens.
Split into simpler sentences: A week after South Ferry reopened, the MTA closed the BMT Myrtle Avenue Line for ten months to improve two of the line's viaducts. The work improves approaches to the line's junction with the BMT Jamaica Line, as well as rebuilds the Fresh Pond Bridge over the Montauk Branch in Queens.