In a younger alder forest, the canopy is usually crowded with many tall and spindly alder trees competing for space and sunlight (left).
(the canopy; is; T:usually; crowded with many tall and spindly alder trees; L:In a younger alder forest) (many tall and spindly alder trees; competing left; for space and sunlight)
the canopy many tall and spindly alder trees
is competing left
T:usually crowded with many tall and spindly alder trees L:In a younger alder forest
for space and sunlight