In many cases, you can produce the same result by creating an extruded feature with a complex profile, or an extruded feature with a simpler profile and some additional features.
For example, if the edges of an extrusion need to be rounded, you can draw a complex sketch that contains sketch fillets (A), or draw a simple sketch and add the fillets as separate features later (B).
 A Complex sketch
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 Extrude
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 B Simple sketch
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 Extrude
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 Add fillet features
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Consider your design intent:
- Complex sketches rebuild faster. Sketch fillets can be recalculated much faster than fillet features, but complex sketches can be harder to create and edit.
- Simple sketches are more flexible and easier to manage. Individual features can be reordered and suppressed, if necessary.