Complex sentence: During the 2017 pre-season, Baptiste ruptured his Achilles with him out for an extended period of time, Adam Clydsdale is filling in for him whilst he is injured.
Split into simpler sentences: During the 2017 pre-season, Baptiste ruptured his Achilles. With him being out for an extended period of time, Adam Clydsdale is filling in for him whilst he is injured.