20:4a Some time later, war broke out with the Philistines at Gezer.

Later, the Israelites ⌊again⌋ went to war with the Philistines at the town of Gezer. (English Easy-to-Read Version)
-or-
Some time after that, the Israelites fought a battle against the Philistines at Gezer. (EEB)

20:4b At that time Sibbecai the Hushathite killed Sippai,

In that battle, Sibbecai from ⌊the clan called⌋ Hushah killed ⌊a man called⌋ Sippai.
-or-
This was when Sibbecai from Hushah killed a giant named Sippai. (GNTD)

20:4c a descendant of the Rephaim, and the Philistines were subdued.

Sippai was a descendant of ⌊a giant called⌋ Rapha. So the Israelites won against the Philistines.
-or-
Sippai was a descendant of the very large people ⌊called the ⌋ Raphaites. So those Philistines became like slaves to the Israelites.

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