Complex sentence: Secondly, it is commonly emphasized that biotopes should not be isolated but be connected with each other because without connection to others, animals and plants there could not move out and biotope would not effectively work as place for diverse organism to live.
Split into simpler sentences: Secondly, it is commonly emphasized that biotopes should not be isolated. Instead biotopes need to be connected to each other and other surrounding life because without connection to life such as animals and plants biotopes would not effectively work as a place for diverse organisms to live.