Complex sentence: Annie though had a plan, she picked a fight with Reva at the top of the stairs at the Spaulding mansion and made it look like Reva pushed her down the stairs and thus caused her to miscarry.
Split into simpler sentences: Annie though had a plan, she picked a fight with Reva at the top of the stairs at the Spaulding mansion. Annie made it look like Reva pushed her down the stairs and thus caused her to miscarry.