Bāʿithun bilā mashaqqah means that Allah will raise created beings on the Day of Resurrection without experiencing hardship in doing so.
إِنَّمَا أَمْرُهُ إِذَا أَرَادَ شَيْئًا أَنْ يَقُولَ لَهُ كُنْ فَيَكُونُ. (Yā Sīn 36:82)
When He wills something, His command is to say, “Be,” and it comes to be.
Every event is subject to His will; raising creation at the Resurrection is likewise no difficulty for Him.