．。。
2. Draw the shape of a boomerang on cardstock with a pen. Cut out the boomerang you drew.
Literal
2. Pen [with-で] cardstock [on-に] boomerang [genitive-の] shape [object-を] draw. Drew boomerang [object-を] cut-out.
A craft-project instruction sheet, in plain-form instructional register. Two separate instructions are delivered as two short sentences. The second uses a relative clause 描いたブーメラン ('the boomerang you drew') to reference the product of the first step — Japanese relative clauses freely pick up antecedents from earlier context. 切り取る is a compound verb: 切る ('cut') + 取る ('take') = 'cut out,' 'cut off and take.' Note the instrumental で on ペンで ('with a pen') and the locative に on 厚紙に ('on the cardstock'), each doing its standard particle job.