Simplify the following text for a Grade 7 native English-speaking person.
Original: In 314 , a civil war erupted between Licinius and Constantine , in which Constantine used the pretext that Licinius was harbouring another of Constantineâ s brothers-in-law , Bassianus , whom Constantine accused of plotting to overthrow him .
Simplified: In 314 , a civil war began between Licinius and Constantine .