Complex sentence: When Pat Gillick resigned as GM of the Orioles at the close of the 1998 season, Wren was named his replacement, however the 1999 Orioles were a major disappointment.
Split into simpler sentences: When Pat Gillick resigned as GM of the Orioles at the close of the 1998 season, Wren was named his replacement. But the 1999 Orioles were a major disappointment.