Complex sentence: One should seek the advancement of humanity and of all life to the greatest degree feasible, to reconcile Renaissance humanism with the 21st century's technoscientific culture, thus, every living creature has the right to determine its personal and social "meaning of life".
Split into simpler sentences: One should seek the advancement of humanity and of all life to the greatest degree feasible and seek to reconcile Renaissance humanism with the 21st century's technoscientific culture. In this light, every living creature has the right to determine its personal and social "meaning of life".