Complex sentence: Hubble is generally mistakenly known for "Lemaître's law", discovered by Georges Lemaître, which is known more extensively as "Hubble's law".
Split into simpler sentences: Hubble is generally mistakenly known for Lemaître's law or "Hubble's law", which was discovered by Georges Lemaître. This relationship became known as Lemaître's law or "Hubble's law".