Complex sentence: Fragmentation caused by urban development is considered one of the biggest threats to biodiversity, as it decreases populations of native species, increases extinction rates, hinders colonization, and increases the risk of habitat loss to invasive species.
Split into simpler sentences: Fragmentation caused by urban development is considered one of the biggest threats to biodiversity. Habitat fragmentation decreases populations of native species, increases extinction rates, hinders colonization, and increases the risk of habitat loss to invasive species.