Complex sentence: It germinates rapidly even in very small amounts of moisture in arid conditions, when young it may be grazed, but that phase lasts for only a brief period, and generally at a time when other forage is relatively plentiful.
Split into simpler sentences: It germinates rapidly even in very small amounts of moisture in arid conditions. When young it may be grazed, but that phase lasts for only a brief period, and generally at a time when other forage is relatively plentiful.