Complex sentence: On the 30th April 2015, Elon Musk announced that the factory heretofore known simply as the "Gigafactory" was now to be known as "Gigafactory 1" as Tesla plans to build more such factories in the future.
Split into simpler sentences: On the 30th April 2015, Elon Musk announced that the factory heretofore known simply as the "Gigafactory" was now known as "Gigafactory 1". Musk mentioned that Tesla plans to build more such factories in the future.