Complex sentence: Plants in fire related disturbance-dependent ecosystems can have serotinous pines, or they have a resin over their seeds to delay seed release, when the fire comes through it melts the resin and allows the seed to begin growing.
Split into simpler sentences: Plants in fire related disturbance-dependent ecosystems can have serotinous pines, or they have a resin over their seeds to delay seed release. When the fire comes through it melts the resin and allows the seed to begin growing.