Complex sentence: This is due to the extensive ecological variability of plants in regard to their environments, soil mixtures, and fungal/mycelial-hyphal networks, it is hard to measure exactly how this occurs in nature and is thus more easily studied in ecto-mycorrhizae.
Split into simpler sentences: This is due to the extensive ecological variability of plants in regard to their environments, soil mixtures, and fungal/mycelial-hyphal networks. It is hard to measure exactly how this occurs in nature and is thus more easily studied in ecto-mycorrhizae.